The message
from The Natural Philosopher contains these words:

Can I watch?
I've never seen a fork lift with 5m forks

Only need about 3.5m...
as long as its past CG...or you can load up one side of the shed and use
even shorter..You can also rope the thing onto it. Sheds do not weigh a
GREAT deal..

Maybe too flimsy to do that. ISTM that most modern sheds and
summerhouses are very flimsy indeed which would of course make them
light as well but this shed is quite large and the larger they are the
more likely it is that lifting it will damage it beyond repair.

If it is strong enough to be jacked up then it would be relatively
simple to do that, stick some modest rails under it and slide it
sideways. It hasn't got far to go. If the bearers happen to run the
wrong way (and sods law says they will) then a second layer of rails
would be needed to sit the shed on first.

The alternative is to take it to pieces and reassemble on the new site.
It would have almost certainly arrived as a kit of parts in the first
place so that shouldn't be impossible.

--
Roger Chapman