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Airflow meter or coil pack maybe, or cam sender, or engine speed sensor. Any of these SHOULD show up on a fault reader.

I had mine fault-code read and all it threw up was an ABS fault (light was coming on occasionally - code clear sorted it), no other codes at all came up. Apparently if it was a dodgy hall sender, the code may not even come up unless the diagnostics machine was plugged in when it actually cut out! and I'm not paying ?29 an hour for a mechanic to ride around with me until it does cut out!
My coil pack did fry itself 6 months ago, but was replaced, so should be OK.

jaseb - don't s'pose you have the fuel pump relay part No. Your cutting out sounds exactly the same as mine in terms of timing. Usually after 15 mins (same spot on A14 usually) and around 76-82 degC oil temp - although this may not be inportant. Does yours just cut out for a fraction of a second and bump-start itself again?

Just for info, I put this query on www.VWmonline.co.uk and got a response suggesting I replace relay 109 in position 3 of the relay board. Without a manual that means nothing to me - is that a fix familiar to anyone else, or is it the same as replacing the "hall sender unit"?

I also have this problem and it is becoming progressively worse.

It has now got to the point where not only do I have to get up at 6 in the morning in the freezing f***ing cold but when i do my 8v will not start at all.

I had the AA out the other day to have a look for me and all he could suggest was cleaning the plugs and ht leads.  Which to his credit worked temporarily.

I am going to try replacing the fuel pump and ecu relays as mentioned and will post any advancements.  However, my symptoms seem to be slightly different in that it only happens now when it is wet.

I was wondering whether this may be due to a dodgy seal or the like, any suggestions would be appreciated.

Maybe damp getting into the ht's. Try a new set of leads and plugs.