I've got a really annoying creak on my '98 Cooper Sport. It's somewhere
on the front suspension at the driver's side.

It doesn't start until the car has been driven a few miles, and how soon
it starts seems to vary according to how long the car has been stood. So
if I drive it everyday, the creak will start after a few miles, but if
it has been stood for a week, then I might go 30 miles before it starts.
Once it starts, it gives a creak with every slight suspension movement.

It seems to be as loud inside the car as outside - not terrifically
loud, but audible above the radio at normal volume. From inside the car
it seems to come from somewhere above my feet under the dash. From
outside it's really hard to tell where it's coming from, but if I push
the suspension down with my hands on the big subframe turret bolt, I can
feel it.

It's only a few months since I replaced the cones and repacked the
knuckles, so I'm fairly confident that the problem is not with those.

Has anyone got any suggestions as to what it could be?