Davina wrote:

Well you can visit the Tower of London, go on a tour led by a yeoman warder (beefeater) and go to see the Crown Jewels, just like Moriarty did. Not directly Sherlock related but taking a river boat down from the Tower to the Houses of Parliament a fantastic way to see the city from the  Thames.

That's a good idea. I could chew gum and wear earbuds, too. Honey, you should see me in a crown!

(I have taken the river tour at night, which is really neat.)

More suggestions welcome!