Perhaps if he stopped telling lies then people might think differently, but when he makes false claims about suing people (he never has), or that he manufactures his own ink (he doesn't) or any other false rhetoric that he pumps out then he does kind of get what he deserves. I am glad the ink is working out for you, I did try it many years ago and it was hopeless, perhaps he has switched Korean supplier ;-)We personally use inkforinkjet inks in our ecotanks but I’m aware some don’t like Ken.
Back on topic, UK PRINTED MUGS why not get a dedicated mug printer? I would recommend some sort of desk top Epson Ecotank with Sublinova Ink. I get my printers, paper and ink etc from Ink Experts. The Profile is spot on and if you have seen my other post it will show you how to get borderless custom mug size prints. In terms of reliability, one of my desktops has done over 35,000 prints which I think is pretty darn good.