need 3 new rads for my 3 bed semi..large front bed medium 2nd bed and small 3rd bedroom..ex council house..just need to know what size rads to go for and where to buy from prices etc...screwfix b & q wickes ?? maybe double rad double convector main bed 1100mm-700mm height width ? simialar size medium..and small bed maybe a 900mm-700mm single rad single convector any suggestions all you plumbers/heating engineers cheers