Thanks for the responses. Erm, the combi boiler is in a seperate little room in the bathroom. The rad in there does also have a valve. I have taken that off and tried to bleed them again last nite but unfortunately it still made the noise. As for the direction, apparently they are multi...
Now I have your attention can you please help me with a huge problem. My fiancee, new born son and I recently brought a newly renovated ground floor flat. There are a total of 5 rads throughout with everyone having a thermastatic valve (which I was told was very odd, only a few should have...