Phil,
Thanks for a most interesting reply. It does sound exactly at that spot.
I actually haven't replaced the front insert, merely swapped a strut from my parts car which of course is unknown, but before I did that there was a constant chattering rattle from the front which now is gone.
Now the noise is much lower and less frequent, sounding very much like that wishbone moving when persuaded by the occasional bump on the dirt.
Yes I live on a dirt road of which there is about 10k's before I get to the tar.
But the car once sorted goes back to my son who lives in town.It will then only get dirt treatment when he comes to visit.
Those bushes seem pretty good with plenty of spring when the strut was out, that is they hang in position because they've been tensioned with the weight of the car on them. They don't look perished either so yes I'll give that idea a try.
Cheers,
Dan