I came across a photo site - fascinating, showing all sorts of stock at Westbury ir recent times - by Julian Sprott who introduces himself of the front page of the site which is at http://westbury-railway-station.fotopic.net/.

It's interesting that I have speculated in the past about the possibility of running a "142" unit on the TransWilts service, but been told that I'm unlikely to see one at Westbury as the drivers in the area are not trained for them.  Well - one made it to Westbury at least a few weeks ago, and is picture on Julian's site.

See http://westbury-railway-station.fotopic.net/p48143488.html

Another idea was that a "Bubblecar" might be used; recently, they've been limited to the Aylesbury - Princes Risborough and Cardiff Bay lines.  But - very recently - it seems one was at Westbury ;-)

See http://westbury-railway-station.fotopic.net/p49758079.html

I don't know what the seating capacity of a "121" is - perhaps it would be insufficient for the TransWilts - but it does make me wonder is some of the ideas that have been shot down as "you'll not see one of those in the area again" are slightly wide of the mark.