This need is going free. It has a slide out thing which means you can put a mattress underneath. A bit like the one in this link. I don't know which model it is exactly though.
https://www.homebase.co.uk/en-uk/julian-bowen-barcelona-white-hideaway-bed/...
Fair Offer Policy applies
Julian Bowen Bed with slide out (SW15)
This offer has been gifted to someone and is no longer available.