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Peter - I have never grown citrus trees before, however they are a lot more affordable these days, and I hope to buy at least one this year.
I have found a link to the RHS - who I find give standard but reliable advice, the thing I would be concerned about is the night-time temperature in an unheated greenhouse in winter. Anyhow, checkout the link and see what you think - the website also has other info about any possible pests etc.
They sound very easy to manage, and from what I can gather off the net, although it is ornamental the fruits can be used in cooking - however this would need further investigation. Please let us know how you get on with it.
RHS Link
Edit: on scrolling down a little it mentions the minimum night-time temperature needed for the Calamondin.
Replied: 29th May 2013 at 21:22