Hello Shaun and welcome to the forum, I am also a member of Ealing and have been known to attend on the odd Saturday when a nice piece of homemade cake is on the table. Have we met? I have had at least one conversation with someone regarding TBH but then they are getting more popular.
Regarding the TBH Ealing will be one of the better associations to go with this format unfortunately there is no training offered for the TBH and as far as I know I am the only one with one but at least they are not anty and are open to all forms of beekeeping.
I have just been checking out the timber merchant from your other post as I pass through West Drayton at times and its always good to know of any new timber merchants.