I have just changed my MAF and what a difference. Car is smoother, pulls better and the MPG readout is now changing dynamically in response to driving style and is registering much higher than it ever has since I have owned the car.
I bought one of eBay, I know guys have said they don't last long but for £36 I figure it was worth the gamble.
Just an update. I am afraid the £36 MAF was a waste of money. Blasted thing conked out a few months after purchase. Moral of the story you get what you pay for. Also eBay sellers "warranty" useless. Not interested in making contact. Running with it disconnected at the moment and am ordering one from Italy.