I will be travelling alone to the UK this Christmas and staying in a B&B for two nights.
One thing I absolutely despise are the radiators that are pretty much found throughout homes in Britian, NI, and Ireland. Not sure about other European nations.
It has gotten very cold this December in Northern Ireland and I don’t want the awful experience that I had last Christmas of being in another b&b experiencing frostbite despite wearing warm socks.
I’m taking two bags, a medium-large sized computer backpack and a medium sized suitcase on Ryanair.
My solution was to purchase something like a mini-Dyson fan that can be placed in my B&B which has temperature control for cool, warm, or hot.
Ever since I was a kid I always loved spending time under air conditioning fans as I loved the breeze. Especially in the winter. Parents said it was too expensive to run which is probably true but on a holiday, I’m not paying for electricity so I say f*ck no to radiators 
Assuming you are from North America, one big problem you will face is the different voltage used across the pond. I don’t think you will be wanting to carry a transformer with you. Or were you considering buying one on arrival?
I live in Northern Ireland but have been to the States for several months. Definitely know what you’re stressing about as I’ve had a blender and expensive toothbrush bought in the US get the strange “new toy car” smell followed by some smoke after I came back and plugged it into the power ports in NI even with an adapter.
Is it true that for electronic items that can’t convert voltage, you need a converter **as well as ** an adapter?
Why not ask the B&B if you can borrow a fan heater? Very common in most households here in the UK. They usually have a fan only/low heat/high heat setting for all your frostbite needs.
Two nights? I’d suggest dropping into Argos or some other large chain store on arrival, and buying a cheap fan heater - something like this maybe:
Then just abandon it in the B&B when you leave.
Might want to ask permission to do this on both power consumption and safety grounds.