Hi Clive,
Couldn't see anything for the rain - that'll help narrow down the time of year in Aviemore - it'll have been Spring, Summer, Autumn, or Winter! Isn't the 'Keith & Dufftown' railway a bit further north than 'Strathspey'?
As for Austerity tanks and a raft of M1s - we've had exactly the same on most of out visits to Bo'ness, and the 'Lakeside & Haverthwaite'.
To get back to your handiwork, these scratchbuilt bodies on the early diesels are truly impressive.
Regards,
Alex.