Electric heater of any kind for my uninsulated attic room (Moseley B13)

Hi freeglers,
it looks like it will be a cold winter in my new room which is in an attic with no insulation and a single glazed window.. yikes.

If anyone has anything they don't use or need, that plugs in, and was bought either at a well known store or is a well known brand you will be doing me a huge service.

I am any any draught excluding plastic window panels. My window is 110(w) x 190(h)cm.

My bed will be right under the slant of the roof so I really appreciate any offers