Hi,
I used to work for david at Double Dutch, am from Crowborough also, was with him for 9 years, then decided to set up on my own, still see him regulary Though .
Anyway he is on holiday at the moment but i spoke to paul who works with him, they use Hydramaster soil break pre-spray, Chemspec high heat as the solution and use prochem spotters and ultrapac renovate, browning prescription etc.
Regards
Ian