Thanks VQ that's makes sense. I haven't managed to get a fleece suit anyway so won't be doing that. I thought I could put tights on with the long sleeve vest to add an extra layer but like you say they'd be hard to take off if warm. Think I'll take a couple of 2.5togs and plenty of blankets. She can wear one of those and I can layer up and down.
I haven't got a SIM, was going to put a travel blanket down followed buy a cot quilt folded in half and put the pop up travel cot on that. I haven't got anything particularly snuggly to put in the cot for her to lay on, suppose a blanket will have to do, or the bottom bit of her buggy footmuff.
I've said if she's cold she'll let us know and she can snuggle up in bed with me