Not sure when you're in London in September but The Old Rose And Crown in Walthamstow is on Thursday nights (at the end of the Victoria line). We will be having an informal session on the 4th but our guest nights start again on 11th, coincidentally with a couple of Americans - Debbie McClatchy on the 11th and Jeff Davis on the 18th finally John Tams and Barry Coope on the 25th details here