Shpropertymaintenance

Is it the only 1 radiator that's heats up are the rest turned on or off if they are all turned off at the valves it could be your diverter valve in the boiler that switches between hot water and heating could be stuck is it newly installed or old sounds old if the valves are stuck it sounds like it could be plumbed in to the hot water strange though do the valves look identical if so you should be able to turn any of them might just be tight if you turn one or both off and your hot water stopes working to a tap you know it's plumbed in wrong if not post a job up and someone can fix this on here for you and make sure they are gas safe if they open your boiler you couls also try feeling the hot pipes and seeing where they go to good luck with your radiator
shaun

They say a week but as long as it all one colour lightened up 3 or 4 days should be fine also use proper undercote for fresh plaster or water down emulsion or it will flake off when you repaint the room later

A days work for a skilled tradesmen 150 up to 250 labour fence panel couple of postes about 60 quid and take waste to tip yourself save abit of money there

Depends if they need 1 coat or two get a couple of tins you can allways take tins back you done use and if you have a open can left keep it in case you need to touch it up yourself