Thank you for the response Mike
I didn't see it for a few days as I totally forgot to refresh the page!
I also had a helpful private message that for some reason or another I cannot seem to respond to, more than likely my lack of forum experience as opposed to a fault in the system!
The car seems to have a fuelling issue, it has a very rough cold idle which smoothes out as the engine warms through, then once on the road refuses to rev under load or heavier throttle inputs. As it gets warmer it seems to get worse to the point of hunting badly and stalling at idle. I am just about to send the computer off for checking as this is the only part I haven't checked on the ancillary side of things.
Air-flow meter and all related parts have been tested along with distributor, throttle position switch and a myriad of other parts!
Fingers crossed the computer might be the problem.
Any other ideas most welcome.
Thanks all.
Simon.