Well I feel like an idiot
After all my checking, I still ended up with two copies of "The Art of Electronics" Second edition.
I presumed as I ordered two different ISBN numbers, I was getting the first and second edition (should have googled each ISBN number, I knew they weren't the 3rd edition number)
I ordered ISBN 9780521370950 and ISBN 0521370957
What actually happened is the Second edition has both an ISBN 10 number and an ISBN 13 number, I ordered one of each (I didn't even realise there was different ISBN numbers)
So if anyone in the UK wants a free second hand copy, you can have it.
Edit, I know Lesley said
Just put ISBN number 9780521370950 or 0521370957 for the 2nd edition
I stupidly read that as one ISBN for the first or one for the second
sorry, my bad for not being clear enough. I thought you were only after the second edition, not the first! I only got the two numbers off the listings, and quoted them for folk to find the cheaper second editions. I thought your confusion earlier was over the Main book and the study guide. It didn't occur to me that you were looking for a first edition book!
I hope you get the right one in a few days.
Things I learned here and to be clear to folk following this.
1) there seems to be TWO ISBN numbering systems, a 13 digit one, and a 10 digit one.
2) The numbers I quoted from the listings, are the two ISBN numbers relating to "The Art Of Electronics, Second Edition"
3) The latest is the Third Edition , but it is considerably more expensive than the 2nd edition. (About 10x in my case)
4) There's a lab manual which is separate, and may be useful. And Also a new X Chapters being released.
5) I'm curious as to what the differences are between the First, Second, And Third editions.
Anyway, apologies @HobGoblyn, for the confusion.