Not all guys oil technicians are cowboys, some just don't want to pay for additional registrations fees. Gas Safe is compulsory for working with Gas, when the same applies with oil then I'll join up.
I would like to join up now, but lets face it, we spend fortunes on courses. I just had to cancel a course due to my work load, and lost my deposit of £100.
I employ a OFTEC guy for signing off and commisioning. I do the commisioning with him and it's not hard. Calibrate the air intake, the oil pump, do a smoke test and a combustion analysis. I can see that jo blogs plumber would need training to do this, but I have the training, but won't join another registration body when I don't have to.