Also don't forget the Forncett Steam Museum in South Norfolk: http://www.forncettsteammuseum.co.uk/ (The website says a new site is coming soon.)
It's actually owned by the same family as the Wells & Walsingham – they must have steam in the blood!
The annual Model Engineers' Day at Forncett comes up on 2nd October. It got some good reviews on here last year.
(OK, I admit it, I organise Model Engineers' Day. Full details and invitations coming soon. Please note the date.)
All the best,
Bill.