It is now the case that I can puchase all the kit I need to install central heating from my local B&Q Store.The mechanics of the install is mechano and could be carried out by anyone with a little common sense and a basic understanding of plumbing. Manufacturers litriture is quite explicate re pumps, valves, trvs and boilers. Let the Corgi Reg. fitter do the gas and boiler commission. Was your heating system installed by a corgi regestered installer?. Why.