Thanks again Kenton,
I called the AA out this afternoon, I said that the oil light had come on after I had driven a couple of miles down the road so I came home again as I thought that there may be a problem with the engine( a bit naughty of me but I didn't mention that it had happened before)
The AA guy checked a few things, oil level etc plus a diagnostics test and said that there was no fault codes showing up.
Advised me not to drive it if the light comes on and stays on, or flashes, but it never does, just goes out once the van has warmed up so I am stumped again?
I'm convinced that it's nothing serious, but then I'm no mechanic should I be booking it into a ford dealer or could it just be the oil pressure sensor needs replacing?
I paid just shy of seven grand for what I thought would be care free motoring