Cold frame inside a poly tunnel would be good. They need to be kept dry and just ticking over at the roots.

personally, i'd place them on some polystyrene, cut them back to about 1" tall and then cover the pots in straw. The plants need to be watered very sparingly but also need a bit of ventilation to stop them going rotten.

I would water only when there's a fairly decent mild spell forecast too. You could probably take the straw away if the weather is going to be good.

Your cold frame in Poly tunnel would be better than the unheated Greenhouse,Wendy,but I would still cover them with something appropriate,as added protection....Some of mine are kept in the shed,also in a plastic growhouse,both covered with garden fleece..lets them breathe a bit..I don't cut any of mine back.only trim them slightly to tidy them up.,I cut them back when new growth appears at soil level,which is usually after I water them properly in the spring.. make sure all dead leaves are removed,as they fall.I agree with Badfish,about standing them on Polystyrene or similar..as long as they are raised off the soil,or a solid base..wherever your cold frame is situated..

Thank you Badfish and Bloomer. The cold frame is made from cement blocks left over from a project with an old shower screen side on top so the blocks retain some heat. Have some polystyrene plant trays I could stand them on. Have some very hardy Mrs Popple in the garden and I don't cut them back until growth starts again in spring so think I will do as Bloomer says and just trim to fit inside cold frame. Many thanks again for the advice

I use a lot of old Polystyrene trays in the bottom of an old cold frame,which is on paving slabs..it really does help..I save all packaging too,especially big flat pieces,to lay on shelves in my growhouse,and if you have any of these,you could line the sides of your cold frame,for more insulation..We don't know what winter has in store for us this year ! Good luck Wendy :o)

thanks bloomer = here's hoping for a mild winter

Re watering, I found it was not necessary to water at all once the leaves have all gone.

Thanks Sue