I knew I had an air leak in the front strut when I jacked it up and heard
the sound weeeeeeeeeeeeeeeeeeeeeeeeeeeeeee.
I replaced it with one from Maxpeedingrods which are made in China
but they have a base in Australia so they were delivered quite quickly.
I must say they looked well made and the light on the dash went out
when I plugged the little wires in properly
Now I have a rattle not very loud her indoors hasn't even mentioned it
and have not been able to find the source so far.
Any similar experiences?

 

Not so far. But pull up the Bilstein you tube instruction video on strut changes, then walk back through each of the several things as had to be disconnected and re-connected.

Could be as simple as not getting the brake line anchor plate bolted back tight?