I'm supposed to be cycling from Cambridge to London in a couple of weeks too.........it's been nice knowing you all!!
I did 75 miles a couple of years ago for one of the big charities round here: Ashford - Canterbury - Margate - Ashford again in a big loop.
You at the end you feel tired but think, wow, that's not so bad then get off the bike and your legs just give way!haha I was told to take a quick ice bath afterwards then a long hot one after that and it seemed to do the trick. I only really ached for about 3 days, same as if you do a big gym session











