It's been some time since your original post Heather and you may well have a greenhouse by now but if not I would recommend that you go to one of the main garden shows where you usually find a number of the better known greenhouse brands. That way you can compare features and prices. At Malvern Spring show this year for example there was cultivar greenhouses, alitex, greenhouse people, gabrielle ash and rhino to name a few. At a show like this there's usually some kind of show offer on too. Hope that helps. Oh and the white plant is Nicotiana as fire Lily says.
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I chose to have it built, well worth the £.
Heather x