Now that I am back allow me the opportunity to apologize for being grumpy. However, those of you who have seen earlier posts will know that I try to identify affordable quality gear, and not just the top brands.
Financially, cycle camping (plus cooking your own meals) is the cheapest way to have a holiday. The only problem is that to enjoy it, it needs some investment (500 pounds total?) in gear.
As for mattresses, I think foam mats are too uncomfortable if like me you are getting on. I slept on them till I was 40. Then my back really did not take it any more. I moved to self inflatables, first the 38 mm variety (not as comfortable as I had hoped) then the 50 mm type. My recent move has been to the 7 cm Downmat. I think the new insulated air mattresses such as the Downmat are the best current technology, as they are far more comfortable, lighter, and pack smaller. Of these, the Exped Synmat Basic is the best buy for temperatures down to a bit below freezing, and the Thermarest Neoair Trekker for warm weather.
Enjoy your trips,
Willem