My house is cold how can I get it more efficient

[Cranky17]

Boo my house is cold, the heating is on, but I just lose heat all the time.
There aren’t enough radiators.
It’s rented.
Can drill holes
Doors don’t quite fit so draughty.
I use too much gas and electric and it’s too expensive.
I use hot water bottles
Throws
Slippers
Socks
Draught excluder on the door
Cat flap taped up
Doors kept closed.
Anything else I can do.

It sounds like you're doing quite a lot. I empathise having lived in many horribly draughty, cold flats! My additions would be:

Reflective foil behind the radiators.

Window film and insulating tape around the inside of doors and windows.

A thick onesie is life-changing!

If the doors don't quite fit, you can get a sort of thick draught-excluding tape you put round the door frame so the door fits more snuggly. I've got a similar situation, so doing pretty much the same sort of things.

And it's pretty much what we all used to do years ago (I remember iced up windows as a kid).

Also little things. I've been going around the house checking for small gaps and plugging them. EG, where the cables come into the house for broadband, etc, I can feel a small draught there. Some discreet stuff to plug it and it's another daught reduced.

Maybe bleed the radiators you do have so they work really well. I would also make sure there's plenty insulation in the attic.

Close the curtains, if you can afford to maybe get some lining curtains. They should fit behind the curtains you already have.
Heated throws are good.

Move.

You'll thank yourself later. Find somewhere you can spend less money on utilities.

No practical advice... maybe the onesie suggestion.

You can get heated throws, but obviously that's only useful if you are sitting most of the time. Start looking for somewhere else to live.

I suppose this will depend on how amicable your landlord is but:
Are the windows double glazed?
Is there a loft and is it insulated?
Are there cavity walls and are they insulated?
Is your boiler efficient?

If no, to any then can you approach your landlord for them. There may be even be grants / subsidies for it for them. The property will be rated if and when you move and will certainly have an impact on renters choosing the property. We definitely looked at that score before we rented.

For yourself, I agree it sounds like you're already doing a lot. It's hard when it's not your property. If you have laminate, maybe so big rugs will help it feel less cold on your feet at least.

What is the temp? A comfortable temp is 20/21 degrees. If it is lower than this I’d consider having a conversation with the landlord to see if there’s anything he can do as you will be considering moving out.

I have a really cold house (think old fashioned terrace with super high ceilings, cracks in the wall, cold part of the country, loo in an extension).
I keep it warm by having heating on all the time but at a low temp.
Also thick curtains. Old fashioned velour ones on a curtain pull rail thing, not modern ones with holes in on a pole. You can change stuff like that when you rent as long as you change it back.
Electric blanket changed my life.

Foil behind the radiators

Leave oven door open after you've used it to allow the heat to dissipate into the room (if no pets or young children of course)

Close curtains at dusk and tuck them behind the radiators

Turn radiators down in unused rooms and close the doors

Wear layers and tuck your best into your trousers and then your trousers into your socks

Avoid damp by getting a dehumidifier. Wipe any condensation off the windows and walls. Open windows a little during the day when drying clothes indoors

I was out of work for a few months last year and couldn't afford to use my heating so wore thermal layers t shirts and jumpers. House was at 4 degrees at some points. Kept duvet on couch downstairs Used to leave oven door open after cooking to warm hands. Got by but it was pretty miserable. probably not an option if you have dc though.

Other option as someone has explained is to turn radiators to anti frost settings in all rooms but one. Perferably downstairs as it will warm room above also

The windows make all the difference. If they aren't double-glazed, look into that window film you can buy to make them work as if they were so. Also thick curtains really help.

I confess before I got double-glazing that I just filled up one of the windows in my living room with a bit of spare floor insulation, which really helped. It wasn't the most attractive thing, but it wasn't awful - it was opaque white padded stuff that still let the light in.

If windows are single glazed definitely that window film that tightens with the hairdryer. Makes an unbelievable difference and is no bother once it’s on.

If there are any rooms you don’t use or heat, keep doors closed and stick ipolystyrene or any insulating material to the cold side of the door.

Definitely thick curtains or if you can afford it, thermal ikea curtains which are even better than the lined thick ones at keeping the cold out.

If you have fireplaces, chimney balloons will make a huge difference.

Thick fleecy hoody (Tesco are selling loads at the moment in their sale). Fleece PJs.
Electric blanket on the bed.
Thick curtains. Tuck them in behind the rads if they are under the window sills.
Regular hot drinks.

Oh and:
Teddy bear fleece duvet covers and bed sheet. Best. Thing. Ever.
Stodgy food.
(We had no heating last year during the snowy freezing spell).

We have a thermal curtain on the front door on a rising portiere rod, so it opens with the door - we seal it in on the bottom with a big draught excluder sausage and it makes a big difference.

Dunelm do thermal curtain liners that you hang behind your normal curtains, they would help insulate your windows. I would put a curtain up at your external doors too, makes a huge difference.

Get a warm mattress topper, or put a spare duvet under your bottom sheet. Two duvets on top of your bed, preferably with one a size bigger than the bed to avoid drafts. If still cold in bed a warm sheet tucked in under your duvet the old fashioned way. You can then turn the heating down low overnight to save money.

I found that leaving the heating on at 18 degrees constantly has massively reduced my bills. My house sounds like yours, old and drafty. I do have thick curtains in both of the bay windows, as that's where most of the heat was escaping. We also have a thick throw on the sofas in the winter, so if you do feel a little cold you just get under it!

I got tension rods (from Wilko) to put over the doors so I could put curtains up. It makes a lot of difference. Even with light curtains.