Hi Liam,
Mark will only ask relevant questions that make you think about the problem and enable you to learn in the process. In other words I would be sure that he knows how to test the MAP but wants you to find out how to do it.

"I have scanned the car and P0108 - Map sensor circuit/high input was showing.
Question is, would this give me the following emission data?;
(FAST IDLE)
CO: 9.247%
HC: 555ppm
LAMBDA: 0.731

CO: 8.543%
HC: 547ppm
LAMBDA: 0.747"

I will put my head above the parapet and say that you have far too much fuel and not a misfire?
A MAP is an important load sensor in as much as that, at WOT you will have minimal manifold depression and at idle or on overrun you will have maximum. WOT requires lots of fuel, therefore if the PCM sees a lack of depression it will chuck in loads.
I think that what Mark is trying to do is get you to look at what the PCM thinks is happening in the way of the message it receives from the MAP. Have a play around with a multi meter on the MAP pins and post the results.
Regards,
Bryan
PS, sorry if you are aware of this but only do resistance tests with the component disconnected.