New Ford owner here, two weeks about.
I have something that sounds very similar here, I got some tyres changed and while it was up in the air asks the mechanics to check the exhaust, as it sounds like that was knocking against some body work or similar. Exhaust was fine. Couldnt see anything obvious here either.
Im starting to think it has something to do with the Suspension, springs, shock somewhere around the right rear.
Did you get to the bottom of this one at all, and if so, how much did it set you back?
Im not sure a spring/shock is something i could repair myself?!
You would need coil spring compression tools to do the job yourself as the spring mounts roung shock absorber, they cost around £25 each (and you realy should replace them as a pair) but the job is not that big and should be done in around an hour (with the right tools) I would expect quite a bit of change from £100