4ft6 x 6ft6 Ortho Mattress - £239.95 - A firm mattress with a lower price tag and continues to be very very popular for it&#x27;s low price, comfy feel and value for money. It is similar in appearance to the Prague but deeper and with a stronger spring and much deeper upholstery quilting. Firm but certainly not hard  The mattress is upholstered on both sides so it can be turned and rotated for a longer life.