Anyone near Swansea with a GEMS P38?

I'm havin a few troubles diagnosing some running probs with my P38 and don't wanna spend a bundle on sensors without knowing for sure they aint working.
Would be great to be able to compare what I'm getting from the OBD on mine with a car that's running nicely, so thought I'd put a cheeky post up to see if there's anyone close to me with a P38 GEMS who can help out.

Shameless bump!
Maybe a wierd request or just no-one in the area! :-/

whats your problem?

Not sure of the best way to describe it...it's a physical stutter from the engine, at motorway speeds she'll drop the revs really quickly and pick back up again so you get a juddery ride, seemingly random.
Don't think it's anything mechanical as it's very intermittent and I can drive all day without it happening.

With the obd software I'm using the MAF is only reading 0.2 KG/Hr and the o2 sensor data seems to drop to 0 often.
With the state of the P38's and generic ODB dongles/software I don't have much faith in the data I'm getting, and the faultmate is a bit out of my budget!

So was hoping to compare what I can see from mine with a smooth running engine to give me a better idea if it is dodgy sensors or poor interface with the software.

No engine ecu fault codes, only other probs is alternator fault message (new alternator charging at 14.5V) and unreliable cruise control.