any one know what size allen key i have to use to get the bottom pipe out of the rad so i can fit a thermo valve as it has a allen key head inside the pipe, and i need to get it off to put the new one in that came with the thermostaic valve as new vale is 15mm going in to rad.
old one looks like a 22mm size union on it
go into any plumber's merchant and ask for a radiator key - don't confuse it with a bleed valve key. should be a standard size, though there are some oddities out there - if so get a universal radiator key.
this is a standard key (or spanner as they call it here):