Forgive me for saying this, but surely you want to be addressing this fault before you leave for Spa? Can't you run the car up to temperature at home and then see whether it will stop and re-start? Being confident that you have fixed it before leaving the country would be a better position to be in as fixing it may be quite time-consuming. I appreciate that Spa doesn't have the pit stop that Brands did, so hot starting is not as critical, but I'd suggest that fixing this earlier rather than later is a good idea (if nothing else because it may get worse, and turn into a cold-starting issue as well. Which would be a real pain in the bum for you.)
In an ideal world I'd book a test morning at Mallory or get it down to Hartech, but I'm away for three weeks, got the builders coming at my house in France, so I've got to be there, then I'm back on the 3rd, and rallying on the 3 Castles rally 5-9 June, then Spa is 13-17th.
But it's not a problem at Spa Oli, it's a flag to flag race on two separate days, so there will be no switching off.
The car has shown no signs of fuel starvation or over fuelling during running, as Neil says it could be something the EMU is getting wrong on a hot restart. What we can do is test on Thursday, starting with the easy options, swap the DME relay, then the temp sensor, followed by the other suggestions.
I'll take it one at a time, and see how we get on.
Half the problem has been it's only ever occurred in race conditions, so it's always been panic stations and trying to diagnose a starting problem with a helmet on is not really sensible.
The test day will be ideal, if we can't solve it there it won't matter for that weekend anyway, and gives us the opportunity to book a test day before the Anglesey meeting on the 30th June.
Thanks for your help.