So you could try it there and buy from
Evans. Personally I wouldn't buy a bike via mail order unless I knew exactly what it was and it was a really good deal and even then I would be hesitant.
I know it depends what you are buying sometimes but I would be thinking, what happens if it has to go back during warranty. May not be likely and many people may disagree but I can't help feeling that buying locally is better.
If you're only talking about saving a few pounds and I'm not sure you're actually saving anything here, I'd go local and look at the choices you have. Just my opinion though.
I don't know the Trek bikes but £350 for a hybrid with no suspension! Should be quite a good bike with good equipment (some of it is Bontrager which is a good brand)