I really need a trusted plumber urgently in S. London. My elderly dad has had one cowboy after another (including British Gas) charging him a fortune to look at it but do nothing and some who 'pretended' to do a power flush and others who made outrageous quotes for new boilers. I am so upset. Can anyone recommend a person they sincerely trust to be honest and competent and give him a quote for either repairing our boiler or installing a new boiler or combi system? Thank you very much in advance.