Tim

At least Phil offers a sensible sollution to your dilema. However dont
worry too much about making up a week concrete. It will resist water
better if made stronger so you will get more time out of your fence.
In addition bring the concrete slighly above ground level in a cone
shape so that water runs off.

An alternative (so long as you or your neighbour isnt growing veg next
to the fence) Is to soak the ends of the posts in used engine oil for
a few days prior to putting them in. This greatly increases their
life, and any garage will give you some for free. You can then take it
to a car breaker, or back to the same garage for them to dispose of.

Good luck

Calum Sabey
NewArk Traditional Kitchens 01556 690544