On a newish housing estate near here there are a number of raised beds made
from pre-cut wood. I'd say the wood sections are about 3" or 4" square in
cross-section and about 4' long. The ends are cut so as to form a sort of
"cross halving" joint and seem to have a hole in them for a metal peg with a
large head.

Anyone know who makes these, or something similar?

TIA

Brian