I looked at a Bike Barn initially and was tempted to go for it.
Then the Keter shed** came on offer @ £590* (versus £200) for the Bike Barn. I decided to bite the bullet and go for the plastic shed - and it's been there for 6 years now. No painting, snaps together in about 2 hours, comes with a plastic floor, which can be thrown down on slabs, concete or like mine, straight on the the grass. I wish I had set it on slabs though, as its a bit undulating now.
Maybe a project for next year to shift it, lay slabs and put it back again. Maybe.
*might be a bit more expensive now. I reckon around £850?
**I said 12 x 8 originally. It's actually 11 x 8.