There's a few inmy group who have 45mm track at home, but use 32mm out and about. Most live steamers tend to be gauge adjustable, so we able to run on either. Obviously battery powered locos are also used, diesel and steam outline. I'll be very surprised if you're "shown the door" as it were at a group get together if you say you use 45mm track. Brambleton have an open day soon, I know it's a trek, but if you can pop down and have a look