Mark the bleed valve so you know where it's set at the moment, then screw it in (anti-clockwise) a turn, and see if it cures it.

Best to get it set up properly, don't know anyone over that way that specialises in RSTs.
I used to live nr Worcester!

Could try hi-tech (near Merry Hill)

http://www.hitechmotorsport.co.uk/

https://passionford.com/forum/ford-e...ands-area.html