Re: The answer is a lemon
It can take down to -5C apparently.
It needs citrus compost and weekly feed - not a lot else.
Mine is 'lovin it' under the veranda
I got it mail order (internet order I suppose) from gardenbargains and am very pleased with the condition it was in, secure packaging etc. It is a proper little tree, a nice straight single stem and it's as tall as me now