I'm having the exact same problem.
The car's been sitting for about 2 weeks under a cover outside in all the rain and snow and frost. When I tried to start it, it turns over but doesnt catch. the rev counter is moving a very small amount, about a needles width. tried a few ideas which didn't work out.
Got two new DME's coming this week (one for spare) and the battery is on charge in the house because I tried a bit too much!
Such a shame too. That car has never failed to start on me until now. I should've grown bigger balls and taken it out in the snow!