Homebrew PCBs

Hi,

Although I have been a lifetime user (addict) to Ferrice Chloride, I
would like to try something a bit cleaner.

Can anyone advise where I can purchase small quantities of Ammonium
Persulphate in the UK ?

When I asked my local chemist about it she looked at me as is I was a
serial poisoner !

Cheers

Stewart
G3RXQ