Oh NOW I really AM excited!

[Bren In Pots]

Could it be this one, it mentions 'the Halls Popular 46 greenhouse' in the description.

Halls Popular 4ft x 6ft Wide Greenhouse - Halls Greenhouses

edited to say there's a PDF build instruction at the bottom of the page so you could compare them with those you've already got.

[organic]

Cheers, Bren.
I do think that's the one. I was on that page last night but didn't scroll down as far as the instructions so that's a great help.
The ones I have so far aren't much more than a parts list so the one on that site, if it is actually that model, are just what I need. I don't really have anything to compare until I start pulling out the parts and see if they match the instructions though.

[Maddie106]

Brilliant Organic....and good luck with putting it all together!

Just a word of warning if you use polythene to "glaze" it. Watch the ventilation, because you need a good airflow on warm days, particularly with a small greenhouse. ( your plants will either cook or everything will damp off and die!)
I suggest a panel at the top(where you'd normally get a window) and a door that you can roll up. Clothes pegs work well for holding panels open!

[organic]

Cheers Maddie.
There's a fair chance I'll be able to get enough glass to glaze this one properly before I need to start putting things in there so I might be OK - but if I do use polythene I'll definitely be following those tips.

I found an old newsgroup post that described an "old timers" way of cutting old glass without the crack wandering all over the pane so I think I'll contact a window company and see if I can take some glass off their hands. If it works like I expect I should be able to glaze the whole thing for free and probably easier than trying to do with with poly and not have it all just blow away.