Thanks for the swift response.
The radiators seem fine (bleed the bathroom one and cold water comes out).
Water has started getting significantly hotter during the past week or so in addition to the radiator going cold. I left the house for c. 4 - 5 days last week and switched both heating...
A problem has developed with my central heating system during the past week or so.
It is a gravity fed system (oil powered) and recently we have noticed a couple of the radiators being colder than normal (noticably the bathroom next to the cylinder). In addition, the cylinder seems to...