Another vote for Emma here - it is certainly no hotter than my old sprung mattress, and no need to turn it over, just rotate occasionally. They aren't exactly "cheap" - normal price is around £600 for a double, however I got mine for around £440 when they had a sale on.
Burnham: Is the Media Tempting Fate by Jumping the Gun?
Govt announces Ukrainian style scheme to bring thousands more migrants to UK
