Sorry to ask, I've managed to pick up one of the above which had a few spots of paint on which I have managed to clean up.  It only has one cable cover and slight anodising to the rear of the wall plate so quite chuffed as I had been on the look out for one for a while.

My question is about the screws to attach it to the BS4 as there are none in the BS4 and unfortunatly it did come with any.

Can I pick up a set of the three screws at my local B&O shop in Cambridge or no longer sold, what size screws are required?