London is a beautiful city and there are lots to do.
I recommend the tower of London as a must while you
are there, and go early if you can and avoid the lines.
The crown jewels are worth the price of admission alone.
The parks are also nice, especially Kensington and Regency
Park. London walks at http://www.walks.com has theme
walks, and the Jack the Ripper walk I took was very
interesting. York is a wonderful medieval walled city and
it is only 2 hr. by train from London, but plan on spending
the night as it has plenty to enterain you... hope you have
Dave in Ohio