Keeping in heat - any ideas

[JohnD]

What is the size of the room, and what is the size of the radiator?

Is the radiator fully hot all over? Top, bottom, middle and sides?

When you close the blind, how much does it help?

 

[Stuart981]

Obviously you cannot do much in someone else's house but if that radiators a single panel, as it looks to me, then you could swap it for a double.

 

[Harry Bloomfield]

Obviously you cannot do much in someone else's house but if that radiators a single panel, as it looks to me, then you could swap it for a double.

If the radiator is getting hot, then a cheap quick fix - would be a slow running fan, blowing air across the radiator.

 

[conny]

As it was probably used as a loft before conversion, there may be insulation under your floorboards. This will be blocking any heat coming up from the lower rooms. Removing it may allow some heat to rise into your room but, you may lose some sound insulation from below.
Definitely heavy lined thermal curtains across the window. That blind will allow heat to escape around all the edges.

 

[RandomGrinch]

As it was probably used as a loft before conversion

Purpose built from the first photos, I'm afraid.