I've had 2 bike sheds (for storing hay etc) ordered online, and been disappointed by both of them
The problem with ordering online is its difficult to judge the quality until it arrives, by which time its too late.
My current one is a T&G and I paid extra for a T&G floor. It was a similar price to the B&Q bike shed, but the quality is absolutely rubbish. When mine arrived I could have almost picked the whole pile of it up by myself - no guts at all. The wood is so thin I think its only the layers of preservative I've slathered on that keep it standing!!!
In comparison the B&Q bike shed, which I'd seen in store, is far superior quality, so be aware of what you're buying. They look and sound good online, but the **** review I gave mine didn't make the website........