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Here I've provide some data and drawings of preliminary designs or the Royal Navy's 1870-90's era battleships, some are quite intriguing!
First are preliminary designs which lead to HMS Inflexible (Fisher's first command). 5 such designs I know of from 1872/73:
Design A: 10.800tons displacement, 20,73m wide hull, 26km/h (14knots) speed, 356mm Belt, 76mm Deck Armour and 2x2 12"/12 MLR Mk II 35-ton cannons
Design B: 11.000tons displacement, 21,33m wide hull, 24km/h (13knots) speed, 356mm Belt, 76mm Deck Armour and 1x1 15"/16 MLR Mk I 50-ton, 2x2 12"/12 MLR Mk II 35-ton cannons
Design C: 11.000tons displacement, 20,73m wide hull, 24km/h (13knots) speed, 356mm Belt, 76mm Deck Armour and 2x2 12"/12 MLR Mk II 35-ton, 2x1 10"/15 MLR Mk I 18-ton cannons (In superfiring positions)
Design D: Unknown displacement, 20,73m wide hull, 26km/h (14knots) speed, 356mm Belt, 76mm Deck Armour and 2x2 12"/12 MLR Mk II 35-ton, 4x1 9"/14 MLR Mk III 12-ton cannons
Design E: Unknown displacement, 21,33m wide hull, 26km/h (14knots) speed, 356mm Belt, 76mm Deck Armour and 2x2,6x1 9"/14 MLR Mk III 12-ton cannons
Sidenote: the drawings shows 12" 35-ton cannons while the data table shows 12" 38-ton ones (Which should be the 12,5" 38-ton RML Mk I or Mk II cannons):
Improved Dreadnought design from 1880:
A new battleship design based on the HMS Dreadnought but updated with never weaponry.
Data on the design (In brackets the original HMS Dreadnought data)
Dimensions: 97,53 (pp) x 21,53 x 8,08m (97,5 (pp) x 104,6 (oa) x 19,5 x 8,08m)
Displacement: 10.886tons (11.000tons)
Armour: Unknown (356mm Machinery 279mm Magazines Belt, 76mm Deck)
Engines: 8.500shp Inverted Compound Expansion engines, 2 shafts (8.210shp Vertical Compound Expansion engines, 2 shafts)
Speed: 28km/h (27km/h
Armaments:
2x2 12"/25 BL Mk IV Cannons (2x2 12,5"/16 MLR Mk I Cannons)
4x1 6"/26 BL Mk IV Guns (6x1 57mm/40 QF Mk I Guns)
(10x1 47mm/40 QF Mk I Guns)
Improved/Modified Admiral Class Battleship Designs - 1881
Design A:
Dimensions: 128,01 (pp) x 22,86 x 8,68m
Displacement: 12.830tons (standard)
Armour: Unknown
Engines: 14.000shp Vertical Triple Expansion engines, 2 shafts
Speed: 33km/h (18knots)
Armaments:
2x1 16"/18 MLR Mk I Cannons
2x2 13,5"/30 BL Mk I Cannons
10x1 6"/26 BL Mk IV Guns
Design B:
Dimensions: Unknown
Displacement: Unknown
Armour: Unknown
Engines: Unknown
Speed: 33km/h (18knots)
Armaments:
2x1 16"/18 MLR Mk I Cannons
2x2 13,5"/30 BL Mk I Cannons
8x1 6"/26 BL Mk IV Guns
Design C:
Dimensions: 97,53 (pp) x 22,86 x 8,68m
Displacement: 11.530tons (standard)
Armour: Unknown
Engines: 10.000shp Vertical Triple Expansion engines, 2 shafts
Speed: 28km/h (15knots)
Armaments:
2x2 16"/18 MLR Mk I Cannons
4x1 6"/26 BL Mk IV Guns
Design D:
Dimensions: 97,53 (pp) x 22,86 x 8,68m
Displacement: 11.530tons (standard)
Armour: Unknown
Engines: 10.000shp Vertical Triple Expansion engines, 2 shafts
Speed: 28km/h (15knots)
Armaments:
2x2 16"/18 MLR Mk I Cannons
4x1 6"/26 BL Mk IV Guns
Preliminary designs of the Victoria class battleships - 1884:
Design A:
Dimensions: 103,6 (pp) x 22,9 x 8,23m
Displacement: 11.500tons (standard)
Armour: Unknown
Engines: 12.000shp Vertical Triple Expansion engines, 2 shafts
Speed: 31km/h (17knots)
Armaments:
3x1 13,5"/30 BL Mk I Cannons
18x1 6"/26 BL Mk IV Guns
13x1 57mm/40 QF Mk I Guns
Design B:
Dimensions: Unknown
Displacement: 10.000tons (standard)
Armour: 356mm Belt, 76mm Deck
Engines: Unknown
Speed: Unknown
Armaments:
1x2,2x1 13,5"/30 BL Mk I Cannons
22x1 6"/26 BL Mk IV Guns
13x1 57mm/40 QF Mk I Guns
Design C:
Dimensions: 103,6 (pp) x 22,9 x 8,4m
Displacement: 11.700tons (standard)
Armour: 356mm Belt, 76mm Deck
Engines: Unknown
Speed: Unknown
Armaments:
2x2 13,5"/30 BL Mk I Cannons
16x1 6"/26 BL Mk IV Guns
14x1 57mm/40 QF Mk I Guns
Design E:
Dimensions: 102,1 (pp) x 21,3 x 8,1m
Displacement: 10.150tons (standard)
Armour: 508mm Belt, 76mm Deck
Engines: 9.800shp Vertical Triple Expansion engines, 2 shafts
Speed: 30km/h (16knots)
Armaments:
1x2 13,5"/30 BL Mk I Cannons
16x1 6"/26 BL Mk IV Guns
13x1 57mm/40 QF Mk I Guns
Design F:
Dimensions: Unknown
Displacement: Unknown
Armour: Unknown
Engines: Unknown
Speed: Unknown
Armaments:
1x2 13,5"/30 BL Mk I Cannons
1x1 10"/32 BL Mk II Cannons
16x1 6"/26 BL Mk IV Guns
13x1 57mm/40 QF Mk I Guns
Drawings and data are from:
Battleships of the British Empire 3 - Rams and Monster Guns
Norman Friedman British Battleships of the Victorian Era
First are preliminary designs which lead to HMS Inflexible (Fisher's first command). 5 such designs I know of from 1872/73:
Design A: 10.800tons displacement, 20,73m wide hull, 26km/h (14knots) speed, 356mm Belt, 76mm Deck Armour and 2x2 12"/12 MLR Mk II 35-ton cannons
Design B: 11.000tons displacement, 21,33m wide hull, 24km/h (13knots) speed, 356mm Belt, 76mm Deck Armour and 1x1 15"/16 MLR Mk I 50-ton, 2x2 12"/12 MLR Mk II 35-ton cannons
Design C: 11.000tons displacement, 20,73m wide hull, 24km/h (13knots) speed, 356mm Belt, 76mm Deck Armour and 2x2 12"/12 MLR Mk II 35-ton, 2x1 10"/15 MLR Mk I 18-ton cannons (In superfiring positions)
Design D: Unknown displacement, 20,73m wide hull, 26km/h (14knots) speed, 356mm Belt, 76mm Deck Armour and 2x2 12"/12 MLR Mk II 35-ton, 4x1 9"/14 MLR Mk III 12-ton cannons
Design E: Unknown displacement, 21,33m wide hull, 26km/h (14knots) speed, 356mm Belt, 76mm Deck Armour and 2x2,6x1 9"/14 MLR Mk III 12-ton cannons
Sidenote: the drawings shows 12" 35-ton cannons while the data table shows 12" 38-ton ones (Which should be the 12,5" 38-ton RML Mk I or Mk II cannons):



Improved Dreadnought design from 1880:
A new battleship design based on the HMS Dreadnought but updated with never weaponry.
Data on the design (In brackets the original HMS Dreadnought data)
Dimensions: 97,53 (pp) x 21,53 x 8,08m (97,5 (pp) x 104,6 (oa) x 19,5 x 8,08m)
Displacement: 10.886tons (11.000tons)
Armour: Unknown (356mm Machinery 279mm Magazines Belt, 76mm Deck)
Engines: 8.500shp Inverted Compound Expansion engines, 2 shafts (8.210shp Vertical Compound Expansion engines, 2 shafts)
Speed: 28km/h (27km/h
Armaments:
2x2 12"/25 BL Mk IV Cannons (2x2 12,5"/16 MLR Mk I Cannons)
4x1 6"/26 BL Mk IV Guns (6x1 57mm/40 QF Mk I Guns)
(10x1 47mm/40 QF Mk I Guns)
Improved/Modified Admiral Class Battleship Designs - 1881
Design A:
Dimensions: 128,01 (pp) x 22,86 x 8,68m
Displacement: 12.830tons (standard)
Armour: Unknown
Engines: 14.000shp Vertical Triple Expansion engines, 2 shafts
Speed: 33km/h (18knots)
Armaments:
2x1 16"/18 MLR Mk I Cannons
2x2 13,5"/30 BL Mk I Cannons
10x1 6"/26 BL Mk IV Guns
Design B:
Dimensions: Unknown
Displacement: Unknown
Armour: Unknown
Engines: Unknown
Speed: 33km/h (18knots)
Armaments:
2x1 16"/18 MLR Mk I Cannons
2x2 13,5"/30 BL Mk I Cannons
8x1 6"/26 BL Mk IV Guns
Design C:
Dimensions: 97,53 (pp) x 22,86 x 8,68m
Displacement: 11.530tons (standard)
Armour: Unknown
Engines: 10.000shp Vertical Triple Expansion engines, 2 shafts
Speed: 28km/h (15knots)
Armaments:
2x2 16"/18 MLR Mk I Cannons
4x1 6"/26 BL Mk IV Guns
Design D:
Dimensions: 97,53 (pp) x 22,86 x 8,68m
Displacement: 11.530tons (standard)
Armour: Unknown
Engines: 10.000shp Vertical Triple Expansion engines, 2 shafts
Speed: 28km/h (15knots)
Armaments:
2x2 16"/18 MLR Mk I Cannons
4x1 6"/26 BL Mk IV Guns
Preliminary designs of the Victoria class battleships - 1884:
Design A:
Dimensions: 103,6 (pp) x 22,9 x 8,23m
Displacement: 11.500tons (standard)
Armour: Unknown
Engines: 12.000shp Vertical Triple Expansion engines, 2 shafts
Speed: 31km/h (17knots)
Armaments:
3x1 13,5"/30 BL Mk I Cannons
18x1 6"/26 BL Mk IV Guns
13x1 57mm/40 QF Mk I Guns
Design B:
Dimensions: Unknown
Displacement: 10.000tons (standard)
Armour: 356mm Belt, 76mm Deck
Engines: Unknown
Speed: Unknown
Armaments:
1x2,2x1 13,5"/30 BL Mk I Cannons
22x1 6"/26 BL Mk IV Guns
13x1 57mm/40 QF Mk I Guns
Design C:
Dimensions: 103,6 (pp) x 22,9 x 8,4m
Displacement: 11.700tons (standard)
Armour: 356mm Belt, 76mm Deck
Engines: Unknown
Speed: Unknown
Armaments:
2x2 13,5"/30 BL Mk I Cannons
16x1 6"/26 BL Mk IV Guns
14x1 57mm/40 QF Mk I Guns
Design E:
Dimensions: 102,1 (pp) x 21,3 x 8,1m
Displacement: 10.150tons (standard)
Armour: 508mm Belt, 76mm Deck
Engines: 9.800shp Vertical Triple Expansion engines, 2 shafts
Speed: 30km/h (16knots)
Armaments:
1x2 13,5"/30 BL Mk I Cannons
16x1 6"/26 BL Mk IV Guns
13x1 57mm/40 QF Mk I Guns
Design F:
Dimensions: Unknown
Displacement: Unknown
Armour: Unknown
Engines: Unknown
Speed: Unknown
Armaments:
1x2 13,5"/30 BL Mk I Cannons
1x1 10"/32 BL Mk II Cannons
16x1 6"/26 BL Mk IV Guns
13x1 57mm/40 QF Mk I Guns

Drawings and data are from:
Battleships of the British Empire 3 - Rams and Monster Guns
Norman Friedman British Battleships of the Victorian Era
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