Went to sainsbury's to get some verbatim CD-R's (none in stock in DIDCOT, doh!) and saw the VERBATIM DUAL LAYER DVD's on sale for HALF PRICE!!
There were plenty in stock as they are usually £12 for 5! (rip off!)
They are the jewel case ones, not spindle, still a good price.. Especially for those 360 backups you may want to make of your originals..