Thanks for input.
I drove down to london, and was okay. I think there is significantly more wrong than a dodgy MAF-
Bizarre injector light problems
Little power on idle/ stalls out when driving slowly at low revs.
Staples corner and the gyratory (NW london) were exciting- having to keep revs high at low speed took some serious pedalling.
I changed the MAF today for an original bosch from ebspares. Sorry Baggers, didnt see the post before I had ordered it.
The injector light problem, dogy idle and dodgy starts have gone! Low power at low speeds also remains.
So in summary - 80% fixed, altho im left with the dangerous 20%.
Anyone have any idea what this could be? Lambda? Sparks? I may take it for some diagnostics tommorow, but don't know anywhere in london.