Paul Corfield wrote:

snip

Thanks for the usual v helpful inf.

As will have been evident, I've not been taking an active interest.
RF180 just reminded me of the days when I used to ferret around
the back of various bus garages for interesting vehicles (50 years ago
when 10 year olds were tolerated in them) . I'll hive off now to
follow up your suggestions.
--
Robin
reply to address is (meant to be) valid