Thanks Les - great information! All these are on my "don't bother" list anyway, but I just felt it would be interesting to have a look. I'll try UKS 1 next (just kidding - only a metre or so short in aperture!).
I'm pretty much at the end of my journey except for the two that haven't presented me the opportunity yet (6229 & 2419). Then I can start all over again! Thanks for your help
Cheers -