Thank you posting this, unfortunately John French missed a few details and mistranscribed the table, I have attached the original to this post and added some further details below:
VT2 (VT1 in John's table is actually VT2) was based on tracings dated 21st October 1914, there is no date for VT but there was only a minor change between the two. Both VT and VT2 were for Design X4. The length figures in John's table above are incorrect, the source document lists them as '620 (659 overall)'.
VP was Design X3. A tracing of the hull form, dated '7th last' (I presume this means July), was received on the 8th of the same month and the model was ready by the 17th August 1914.
YG & YN are actually VG and VN, VG was one of the U series (possibly U3 - the document is damaged). VN was 'simply VG lengthened somewhat in forebody and shortened in afterbody, retaining the same normal displacement viz :- 28,000 tons'.
The final reference to X3 and X4 in the Haslar papers is dated 4th December 1914. All of these designs are referred to as being for the '1914-15 Battleships - Dockyard Built'. Given the dates this is probably the best, and only, evidence that the final designs considered for Agincourt were X3 and X4, with X4 being the very last. It also seems likely that these were generated after the rejection of Design Y, implying the Admiralty were still homing in on a fast battleship (25 knots), having chosen to seek more protection than that offered by a battlecruiser. With the proposed lay down dates being January 1915 X4 would have been getting close to the cut-off for agreeing the new design, though there still would have been ~2 months for continued development.
