Can you identify these blocks, please? Radfords?

Hi all,

I am going to be building a new extension soon, and want to get hold of the same type of blocks that my house is made from. I've put a couple of photos up here:

anyone know what they are called, and where I might get hold of them? I particularly want to get hold of the specially shaped blocks making up the window surrounds.They are basically normal concrete blocks with a fake stone facing. My local builder's merchant has similar blocks but the stone facing has a smooth, polished finish, whereas my blocks have a rougher, combed finish.. A neighbour thought that the blocks were either called Radfords, or were made by a company called Radfords, but I haven't been able to find out any more than that. The house is on the outskirts of Bath and was built in the late

50's, if that helps.

thanks,

dan.