In 2066 Britain will look 95% like it does now.
In 2366 Britain will be different. It will have a "lesser stature" and the median Brit will be darker. He will look like Roger Federer.
The progeny of many British VEFers will no longer be living in Britain. They will be in States of the "highest stature" like New England and Pacifica (Pacific Northwest). The great grandchildren of Mal Hombre and bloke57, 2 VEF friends of mine, will probably be living in Newcastle, CA. Heck, 1 of Mal's great X15 grandsons will probably marry 1 of my great X15 granddaughters.