My king size duvet has gone so flat it looks more like a counterpane. I'm confused by tog ratings etc and who has the space to store different seasonal duvets! I get sweaty during the night so don't want a duvet that will be very hot, and I have an electric blanket to keep me warm anyway. Can anyone recommend an all year not too warm duvet (preferably under £40) that is big and squishy please. Thanks!