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chrisbmx116-
You can get a surround that will give you more space to fit a dimmer but your switches are no longer surface mounted. I've used them a couple of times where functionality is more important than looks.
On the other hand cutting a new hole in the plasterboard and moving the box next to the joist is not beyond the wit of man.
Airhead
Hopefully they are not notched into the studs (wood bits!), it can be difficult to change backboxes but it's usually easier in plasterboard than any other type of wall. There is such a thing as a plasterboard back box which is only supported by the plasterboard so you could move the sockets to the side of stud and fill the old hole with the piece of plasterboard you cut out for the new one (given that the wires are long enough).