Heres another iHas drive for £22.78 delivered which dave has kindly double checked for me so is the correct one this time
http://www.ebay.co.uk/itm/LiteOn-IHAS124-19-24x-SATA-DVDRW-DVD-RW-Writer-Rewriter-Burner-/160899654448?pt=UK_Computing_Drives_Storage_CD_DVD_Drives_ET&hash=item25765de330
http://www.ebay.co.uk/itm/LiteOn-IHAS124-19-24x-SATA-DVDRW-DVD-RW-Writer-Rewriter-Burner-/160899654448?pt=UK_Computing_Drives_Storage_CD_DVD_Drives_ET&hash=item25765de330