Hey there,
I know this is a very old thread, but I had the same issue with my Opel Corsa Lite - been driving it for just over 3 years now, and it also cut out while I was driving. It was driving me nuts!! So I took it to McCarthy, and they told me it was one of the fuel pump relays (and it 'only' cost about R1 200...) - that was last friday. It seems ok sofar, I just hope it doesn't happen again...
One thing is for sure, though, my next car is NOT going to be a Corsa Lite, lol...