Thanks for the advice ...
Is their something about the format DL's work that RW's cant be made, or maybe its just early days for DL DVD drives ?
DL DVD-R's seem to work out around £5 per disc, I use reliable bulk buy 4.7gig single layer ones for around 12p each ... it doesn't add up .... maybe in a year or so DL's will catch up.
To think 700Meg on a CDR was the stuff of sci-fi only a few years ago !