Average speed cameras are easy to cope with, as long as you know where they are. There's one camera for each lane, so as long as you exit on a different lane from the one you entered on you should be ok.
I know this because I wrote to a national newspaper saying how much I hated all speed cameras, but especially average ones. They came back with this handy little tip.
Or you could hang a blanket over your number plate.
Cheers