on the first occasion I copied and pasted, on the second I copied them into notepad.
I finaly selected view source and copied and pasted from the HTML code.
My last test was to create a new api set using my own payupal account however it appears these credentials were wrong as well.
I have two shops waiting to launch but neither appear to work with Paypal UK
Wish I could give you a solution but in a way I'm happy because at least I know it's not me