I went to Colin at Chingford late last year to get my (2nd) treatment done. Absolutely fantastic guy and does an excellent job taking care of my bike, my grudge however is with all year biker themselves.
They have still not given Colin any certificates that are usually handed out with every ACF treatment. I emailed them three times and “tweeted” them, all to no results so I feel like being ignored completely.
So if you’re going to an AYB franchise please check ahead if they have certificates, provided they mean anything to you.