Hi Mike
Thansk for the reply - I bought a bag of 100 NScale pre-painted figures off ebay for £4.50 that shipped from Hong Kong - these took about a week to arrive and will do the job for the interior - I shall have the roof half clear on the model with the figures so you can look down into the hull. The cars were bought as a bag of 30 off ebay (N scale again) for £3 in the UK - they are bog standard model rail type scenery add-ons but like the figures, will do the trick just to add detail.
I have the 8 clear plastic 1960's era cars that came with the kits which will be used as boarding and offloading vehicles on the diorama - I think they are an Austin 1100 and a VW Beetle
More pictures shoudl go up on the forum tomorrow
regards - John