Huh? How do you figure that?
The Gauntlet had a 645hp Bristol Mercury VI.S2.
The first 50 P.11C had a 560hp Mercury V.S2 and the remaining125 had the same 645hp Bristol Mercury VI.S2 (albeit licence-built by Skoda).
The P.11C was about 10mph faster at altitude.
The later P.11g of 1939 had an 840hp Mercury VIII. Indeed the P.11 was further developed for export as the P.24 with 760-930hp Gnome-Rhones. So PZL were well aware of the need to put vastly more horsepower into the design. Even the P.24F with 970hp wasn't able to do more than 267mph (the I-16 tip 24 could do 20mph better on similar horsepower from its M-63).
But even if the RAF got a P.11/I-16 clone in service in 1935/36 it wouldn't have been any better against the Bf 109 of 1940 than the Gladiator, P.11, P.24 or I-16.
Let's not forget than when Spec F.7/30 was drawn up, no-one had forseen fast monoplane bombers like the Do 17, even the DC-1 and Boeing 247 were 3 years in the future. The Air Staff were thinking of lumbering Potezs not He 111s. A LOT of development was packed into 1933-38 in aviation, what looked cool in 1932 was crap by 1936 and what seemed the bee's knees in 1935 was lame by 1939.
Nowadays though there seems to be some revisionist views that Gloster could have jumped from Gladiator to Meteor by 1940 if the RAF had only listened to Whittle...
