Topic deviation alert!
Chris, one for you, if possible.
Back in the 60's, IA moved into their brand new Terminus House in Shepperton. I'm not sure if you were on board at that time or not.... However, there was a rumour at the time that IA was considering an attraction similar to that offered by Peco at their offices - some kind of model railway display I guess. In the end, he went for a travel agency - but did at least have a pullman car at the back on the former platform 2.
I can't say where this rumour started, or if it was mere schoolboy gossip. Possibly it was, after reading your comments re the lack of interest IA had in model railways, coupled to the fact that Shepperton is hardly a tourist destination!
Have you any memories of this time that you could share?
Sorry for swerving the topic!