BigWallop wrote:
"flash"wrote...
I do have some thick timbers but they are all three foot long, so what I
want to do is join them together somewho to make six foot posts.

Half and half joints would do this for you.

What the hell's one of those? Do you smoke it? Do you mean a halving?
Perhaps you mean a lapped joint?

Measure half the thickness of
the timber and mark it from end to about four inches in. Do the same with
another post. Cut down to half the thickness, then cut off from the end to
the cut down.

You should have two posts that will marry up to give a full thickness post
with a hidden joint. You can glue and screw through to make the join good
and strong.

He'd probably be better off using simple joining plates. Put some
boards up against the butted-together posts, and lam in some nails,
or even screws, as it's an allotment shed. No joint cutting at all.