the one in west yorks let me down in a bad way. Took two weeks to tell me he couldn't make a scheduled appointment, re-arranged for a week later, then told me 5 mins before he was due to turn up that he couldn't do the job!!!
fecking git. wasted 3 weeks - i've subsequently had to cancel my permagard top up for another month.
w*****s.
their quality i can't vouch for but their customer service is poor.