Sorry to hear it's not fixed DJB, maybe now it doesn't run at all, they can pin point the exact problem?
I seem to have jinxed myself with saying mine "starts first time every time"!

Went out on Sunday (it's what us old grey haired balding guys do) and the ABS light came on.
As I'd replaced all of the sensors about 4 - 5 Years ago (about 2k miles) I thought it can't be one of them, unless it's a broken wire?
So Yesterday I stripped down the front and checked the sensors, found it first time, N/S/F sensor no resistance (broken wire) took the sensor and wire off, easy with them coated in copper slip.
Cut into the wire where I thought it might be broken, going on the meter readings when I pulled the wire about.
Couldn't believe my luck when I found the broken wire right in the centre of the cut, quickly soldered it up, fitted some shrink sleeving and taped the section back up with some self amalgamating rubber tape for a good waterproof seal.
At this point I was quite please with myself!
But that didn't last long, as today (Tuesday) I went to the doctors, car started normally, came out from the doctors, it wouldn't start!

Just spinning over no sign of life at all, gave everything a wiggle (plug & coil leads), still nothing.
Then suddenly as if the plug leads were on wrong it started to misfire and stop it turning.
Kept on trying four or five times more, and then again just as suddenly it started as if nothing was wrong, drove home perfect, been out several times and tried it and it starts first time?

So now I'm wondering if it will do it again?
Going to Cornwall next week so that will be interesting

I'm thinking crankshaft sensor or possibly a broken wire near the plug/connector next to the rocker cover, as I replaced the sensor last year?
Fun! isn't it?