Be sure to check out the cafe downstairs and the brass rubbings.
This is a lovely church to visit, and they offer some great concerts. The Academy of St. Martin-in-the-fields orchestra is outstanding! If you visit the crypt in the basement, they offer brass rubbings - its fun to do, and could make a very nice souvenir with the right mat and frame. Fun for kids, too.
This charming old church on Trafalgar Square houses a well-regarded restaurant (which is a fund raiser for community outreach programs) and hosts an impressive music series. Check the schedule for its vast variety of concerts and recitals. We walked in during a free lunch time concert, when we needed a break from the crowds at the nearby British Museum.
they have fantastic classical events hold in their crypt couple of times every week.
Xmas classical concerts are always great.