I've been quite taken of late with the Dormeo advert for their Octaspring mattress toppers (they are having a sale, which makes it look marginally affordable for a king size topper).
However I've looked into it, and you're not supposed to use memory foam mattresses or mattress toppers with hot water bottles - because direct heat on the foam can cause the foam to degrade and it can release smelly fumes.
I am wedded to my hot water bottle winter routine, I cannot (as per the advice) "turn your heating up by 1 degree instead of using an electric blanket or hot water bottle", because I don't have my heating on, like ever, and I fucking love hot water bottles.
Any ideas for affordable non-memory foam hypoallergenic no down or wool mattresses or toppers?