While we spent two weeks in London, we did get out of town. We took two bus day trips using Golden Tours. GT picks up at the major hotels. The guides were excellent and we got to see the country side.
We also took three train day trips to Oxford, Brighton, and York. The evenings that we did not have day trips, we had theater tickets. I booked everthing online weeks before we even packed our bags. With the train tickets you can get a considerable discount buying BritRail passes.
DH is the active type and I didn't know how he'd do on a bus which is why I only booked day trips. Some years ago, I did a week-long CIE bus tour of Ireland (excellent), while DH and DS spent a week camping in the mountains. I can't imagine how DH would cope with all that time on a bus and being herded from (nonetheless outstanding) place to place.