Okay, have a slight rough idle, up and down a few hundred revs, car just doesn't idle smooth or nice. But car drives nicely. Disconnected MAF completely, car now idles much better. Took it for a drive and obviously doesn't drive as well as with the maf. Have a K&n filter on. Do yous reckon it's the maf or something else? 

Has it had a K&N on for a while,

but a nice new one, or at least still clean and also not re-oiled / treated or dirty / clogged and strangling the car as K&N's can?

I have no idea mate. I'd imagine so. I haven't had the car long. Maybe two months. The fella I bought it off had it one year and only done 80 miles in that year. Since I've got it I've done about a thousand miles. Sparks changed, fully serviced, oil, oil filter, fuel filter, new washers and seals on the injectors, full coolant flush and replaced the PCV pipes as they were cracked and perished. To be honest I'd say that filter has been on awhile without being touched. 

Youve done the test and got the correct answer - its the maf. get a new genuine one, not any aftermarket ones, as the engine doesnt like non original sensors