I will be in London in July and would like to do the St Paul's Cathedral Triforium tour (since I've done their other tours already). However, they will only do it if 5 people sign up and I am travelling solo. They said they would put my name down and let me know if they are doing one when I am there, but I figured I'd see if there were 4 other people interested in it. Possible dates I could do the tour are 13 July at 1400, 16 and 17 July at either 1130 or 1400, and 23 and 24 July at either 1130 or 1400.
Here's a link to the description of the tour from the St Paul's website. (It says £19.50 there but the email they sent me said £20.)
Here's a wikipedia link to the triforium, since I didn't actually know what it was before I saw this tour:
If anyone is interested, post the dates you would be able to go here, and if we get enough people for any particular day I will let them know at St Paul's.