Britain without coal

[Greyblades]

As others have pointed out, it's unlikely that the lack of local coal would have been a particular detriment to Great Britain technologically or otherwise.
I believe that history would have carried on as it did up until the great wars, in both cases Britain's ability to import was hampered by both iterations of Germany's navy. The absence of local coal on top of all the other material shortages could have been enough to affect it's performances, if not in the first, certainly it would have made the second world war a much more close affair perhaps even spelling defeat for the still somewhat coal reliant Royal navy.

[El Barto]

I've belatedly realised that one must also wonder what'd've happened to Thatcher's government if she hadn't had any coal miners on home soil to rail against.