If you still have to do this… I recommend Transchem. Just done ADR/DCPC combined with them at Wakefield over 2.5 weekends… great instructor, Eric…good content and something proactive for the business by way of ADR…
No, I’m not on commission!! just heard of a lot of crap training about and can’t fault this mob at all. 
just done 4th day of the dcpc yesterday,feel like ive got a touch of depression,be glad to get back to work today 
and yes the 30 quid a turn of the winding handle was said.
if you are not paying for it yourself its ok for a change to have natter and a laugh at all the moaning and rubbish talk ,i dont know how some drivers get thru the day