Chris,
It is horses for courses.. Depends where you want to go modelling-wise?
If you definitely want to go live-steam, and small loco's, then there is probably more mileage in 32mm.
If the track will be at ground-level, and young children are likely to be around, then the likes of LGB 45mm track are pretty bomb-proof. - Football, and kids walking on it to..
Buildings, and other line-side features would need to be moveable, else boisterous kids can cause damage, just from exuberance!
If you want 'british' outline, then you may well end up having to build (kit bash) to suit.
If you are of a 'model engineering' bent, then most model engineers sites seem to have 32mm track as well. - I think it is the 'engineering' and 2-foot scale that attracts them to this.
The Gauge 1 / 45mm (hence, 1 metre European) mainly comes from LGB being the predominant RTR supplier in this gauge. The European (and American) markets being their main target.
Mostly, get something down, and enjoy it.. Even if it is a 'starter' set in the house somewhere. - Christmas present to self??
'Rule 8' states it is your railway, and you run what you like. - Many of us 'mix and match' scales and geography with what we run.