They use ‘better’ (more expensive) equipment and offer a guarantee on ‘cop’. They are far more thorough with surveys and calculations, but you’re right you pay for it.
I know exactly but its the cost that these things all come down too and as im sure someone else in here found out it was like 20k and they would save £8 a month.
Bet the price is a lot more via HG and that’s is what most folk look at these days