The British response to a lot of cheating was 10,000, 11,000 its not a massive difference and they aren't too far outside the rules.If I recall correctly the British and Americans were aware to varying degrees of cheating in the Italian and Japanese navies. But decided to ignore them as the margins were not so great that the ships were superior to their own ships.
We know they are cheating but not by enough to walk out and trigger an arms race.
Britain worked out the weight of every new ship give or take 5 % within 6 months or two of all powers giving the required notification.
When an Italian ship needed drydocking in Gibraltar due to major problems during the Spanish neutrality patrols the British found out the exact weight of the cruiser in question and adjusted their formulas to work out the weight of every Italian ship (within 2%).
Edit: Given that the British were a bit loose about everyone else's approach to the rules I sometimes wonder why the British didn't nudge their own ships a few % outside the limits. If they can do it so can we. I also wonder what the response would have been if Britain sends a note to the Italian government "We note the completion of your new Zara class battleship (as it does not fit the definition of cruiser) using up the unused battleship tonnage available to Italy under the naval treaties".
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