Interesting that the VNE is given as 155 kts. In my day it was 173.
That's one of the differences between military and UK civil certification. I fly a Mk 22, originally a T10. IAS limit as a T10 was 173 kt, now as a Mk 22 it is 155 kt. Also the x-wind limit has come down from 15 kt to 10 kt. So, no, the T10 was not "beefed up".