Thanks Norm - mainly I just wanted to run my thinking past some people with more experience to see if I was on the right track - seems like I am, more or less!

What's the best way to anchor it to the ground though? I don't fancy digging out concrete foundations, is there an easier method?

(I've pretty much decided to get a plastic one at least for this year, so I've got time on my side for working out the best way to go about organising a proper greenhouse.)

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Warning: I have a dangerous tendency to act like I know what I'm talking about.