Yeah, i had thought of that, but when i picked the car up and drove it home, it ran fine, albeit with a blowing exhaust. It made very good power and idled ok. After i had made the repair to the exhaust a few days later, i fired it up and it ran lumpy. Its not cutting out on the road and i can feel the vtec system is still working ok. The tacho reads fine and theres no check engine light either. Just a bit of a misfire which you can barely hear at higher revs, but that pops a bit at lower revs and won't idle. When i fitted the new parts, the situation improved marginally, as i would have expected.
I'm pretty sure the belt hasn't really had a chance to jump, as apart from the 150 mile journey home, the car hasn't made any other significant trips.
Got to be the dizzy hasn't it....?

 

check compression and check ignition timing