Things I should be sure to do in the UK December 2016/January 2016

HELLO!
I am going with my wife to the UK, her homeland. Our 'base of operations" is going to be Manchester, where her sister lives. But we are also going to Oxford, Cornwall, London for a day or two, and a few other place not yet decided.

Where to go? What to do? Really old pubs? Particularly good scotch eggs? Beer? Cheese? Book shops? I am interested in hearing traditional English folk music and dance music, if anyone has any good recommendations.

British Museum worth a peek?
Anyone been to the Eden Project in cornwall?

Already planning to see -- Stonehenge, Tintagel, one of the oldest trees in the world near Manchester, depending ont he programming I would like to check out a folk music even at the Cecil Sharp house.

British Museum worth a peek?

oh cmon kid, a day surely

i might be going next month if i can get my passport expedited

we are only going to be in london for about 2-3 days so i am trying to narrow it down.... entire trip is about 3.5 weeks, including three days in iceland on the way.

best used bookstores in manchester, oxford, cornwall...?

Cornwall tip:

Bodmin Jail is far more interesting than The Eden Project.

http://www.haunted-britain.com/images/bodmin-jail-wing.jpg
It is a pisser to get to on public transport but it is worth it imo.