Thanks for your advice guys.
Yes I undid the gate valve from the f&e tank - it didn't feel seized. I've obviously bled all the rads, is there anywhere else I need to bleed to make sure there's no airlock?
Just read-up on blocked feed - sounds right. Certainly lots of black stuff came out...
Hi All,
Let me tell you where I'm at: I hate DIY because I don't know what I'm doing and I don't have the right tools.
The missus made me try to fix a radiator in the kitchen, which was switched off all last winter because the valves were knackered. After trying for several hours to repair...