All fixed 馃憤
As suggested, I put two other screws back in and used Al's method with the screwdriver.
After a bit of gentle coaxing it started to turn, it was then just a matter of teasing it out.
Thanks for the input people, most helpful (although I waved my wand like a lunatic - nothing!!!!! - so that tip is a no-go 馃槈)
Cheers
Jim