The mattress in our lovely Chausson Flash S2 really let it down because it was a bit like sleeping on the floor. After a great deal of searching I took it along to The upholstery shop in Totton SO40 8DX Tel 023 8066 0811. I found them to be very polite and helpful and had plenty of Motorhome and caravan experience. They unpicked the mattress cover replaced the foam and underside base material with one of a much better quality then fitted a full zip across underside all this was expertly carried out for just £180, (alternative quote was around £600 plus p&p elsewhere) The comfort is now fantastic. I was so pleased with the outcome we had our sofa, two memory foam cushions to fit the front Motorhome seats and two more for other travel done as well. I hope this is useful for other members because a good nights sleep is so important.