I'm sure they don't want to sell these.
I rang my local B&Q last week to ask if they had any and was told they had all been sold weeks ago, then my son-in-law told me they still had them. I went in to look and sure enough they had loads of the polycarbonate ones in 6'x4' and 8'x6' and a few glass ones in 6'x4'. I was looking at them and an assistant came up and said he wouldn't buy one if he was me. He said they were only fit for scrap as they were all missing pieces.
Despite his words I bought two of the 6'x4' glass ones.
A couple of days later I unpacked them, the plastic boxes were falling to pieces and the cardboard packaging was saturated. I compared the contents of the two boxes and it appeared there was a bundle of parts missing from one of them. I took the equivalent bundle back to B&Q (without the receipt) and explained that I had bought two and one was missing these parts. The nice girl on the returns desk opened the last one they had and gave me the missing parts.
I managed to salvage a set of instructions, one set had disintegrated. If anyone needs a copy I will scan it. I am sure these are re-badged Hall's greenhouses. I just downloaded the instructions from their website and they look pretty similar to the ones that came with my greenhouse. Will do a more thorough comparison in the week when I can bring them back from the plot.
I don't know what I am going to do with them yet but they were too good a deal to miss. I may use them as peach greenhouses or cut them in half and net them to protect my 'soon to be' fan cherry trees. If nothing else I think the roof-lights are the same as on my large greenhouse so I may use them on there for extra ventilation, considering that Halls charge £33 just for a roof-light, I would class it as pay-off.
Incidentally, they are orientated such that the gable end is the 6' dimension, therefore with a little engineering you could make a 6'x8' with a central partition if you wanted to heat a smaller area. Or add an extension onto an existing greenhouse.
They are also selling the bases. I haven't looked closely at them but they might make 5" raised beds.