I can't profess to know a lot about these, Pete, but I think it's one of these, belonging to BBF that I had a go with at the last Bash and it was lovely. Trigger seemed fairly good, too.
Hopefully Ray (BBF) and Ray (Transporter - who has quite a few lovely AA sidelevers) will be along to assist.
The only things that I see as a negative are the references to many of the spares being unobtainum-ish?