Oooh thanks guys, learning loads here.
IIRC from the room gallery thread your room has bare brick walls and is in an attic, or am I thinking of someone else?
I'm guessing it is down to a lack of insulation in the walls and the roof space.
It's me! but my old house
She made me move cause it was too masculine. In fairness, it was totally a bachelor pad (and pretty impractical).
Ok so. There's no obvious drafts but it IS noticeably colder by the window. The radiator is working (and is large) so theres no worries there. The gap under the door ive started stuffing when i go out to see if it makes a difference (today's weather was noticeably more mild than recent days so nothing reliable to report). Insulation i havent checked, so that might be a good place to look although the other upstairs rooms seem fine (badly laid maybe?). Under the room is the living room which is stupidly warm all the time, but also the entry hall which does get a little nippy.. so that could be a big factor? The bedroom carpet is... well it looks like it was laid by someone who had once heard about carpet by rough description; so i assume insulation and underlay is equally as shoddy. Could be a cause there.
I'm reluctant to put too much effort in as it's rented, but I want to learn how to figure these things out and all your suggestions are perfect. I'll be buying my first place next year and i'll need to know how to fix this stuff.
As for the poltergeists idea.. well, the GF is convinced my Dad is knocking about so who knows
My feelings from your responses is poor window seal (it is definitely cooler by the window) and bad floor insulation. Ill report back with more findings!