Here's a link to what seems as though it might be their address. Berekely Square is quite a prestigious place. #43 is just a few doors from Annabel's night club where nightingales go to get stuffed, full of champagne and other goodies.
http://www.berkeleysquareestate.com/...20download.pdf One suspects that this might just be what used to be known as an accommodation address but how would one know for sure?
£295 is a lot of money for what is really just a flyer. Every airline for which I have ever flown has done its own in house training and I don't remember any occasion when a 'Cabin Crew Manager' came in as a #1.
Edit to add that I am/was cockpit crew not cabin crew.