Do:
Try some brown ales
Try a ploughman's lunch
Find a good Indian restaurant
Go to the Churchill Museum if you have time
Walk through Hyde's Park and Kensington Gardens
Don't:
Forget a rain jacket
Bother with cabs in the city - the Tube is efficient and easy to navigate
Go to a (non-touristy) pub and slowly deliberate and ask about the selection - just order with confidence (and, particularly if you're a male, you order a pint)
