Excellent information there, cheers matey.
And many thanks for all who chipped in.....I've just looked in and saw this thread up to date.
When I managed to sneak another 35 past the Mrs last year, the shop also had a very nice, boxed Brummy Tempest.....I'd mentioned I'd maybe get one, one day....He went round the back and re-appeared with this little gem. "I'd love it, but I don't think I could afford it" I said, expecting it to be £100+. But I've had a fair few guns from him over the last three years and said I could have it for £60. I didn't hesitate!
Hardly used it, will have a plink again soon, but at least I have one!