Double bed frame (Shepton Mallet BA4)

Im in need of a double bedframe. The stairs to my 4th floor flat are extremely narrow. A divan style bed would not fit, not in one peice anyway. I had a frame but it was very very old and it's on its way out. Ive already tried to sort it and fix it several time but its not going to last much longer. If anybody had a frame that comes apart that would be amazing. Thank you