On 14/05/2020 10:51, Robert wrote:
On 14/05/2020 09:25, Brian Gaff (Sofa 2) wrote:
Most of the concrete posts I've ever used have several holes already
and one
simply uses long galvanised bolts and nuts to secure the wood.

Brian

+1 bolt through rather than expansion fittings or rawlplugs.

It's not his post. The only way to do it is, after agreeing
with neighbour who owns the post, clamp a length of treated
4*2 or 3*1.5 to the concrete with stainless steel jubilee
clips. Then fix your gate hinges on your own wall, and use
the post/timber combo as a gate stop.