Pablo wrote:
I've got myself some Heavy Duty RediDrivas from screwfix. How do I
use them? Do I drill a hole first then screw in the base then the
screw?
No
http://tinyurl.com/vdu1

These are for plasterboard. The base is screwed in using a posi screwdriver,
see the point on one end of the swivel bit? it cuts its own hole.
The ones I bought had instructions ...