I'm looking to source a set of EI salts also.
I'm coming back to having a planted aquarium after a 16 year hiatus, so EI dosing is new to me even though CO2 and the rest isn't so much.
Could you (or anyone else) confirm if APFUK are still operating? I've e-mailed them and filled out their website contact form, and had no response so far - there is no telephone number on their website either to be able to contact them directly.
Are there any other sources for starter kits if I'm not able to get in touch with APFUK?