After much deliberating, I have bought a Thermorest one for £80 from Babies R Us. Mainly due to the fact I went for a cotbed is why I thought I'd invest more and get a sprung one. Helped also by the fact that I signed up for the Toys R Us gold car, so ended up being sent a voucher for £10 off any purchase over £70. I'm really pleased with the mattress. Must say, it feels more comfortable than my own mattress!!!!