Thanks, found out one chemist Matt Flannery still dispenses Isopropyl alcohol from a larger bottle to smaller sale ones. So cost 1.51Eur whereas otherwise was a litre bottle for 15Eur.
But took it home found out how to dismantle disc burner, cleaned out all the dust that had accumulated over the 3 or 4 years. That must have been something of a growing problem itself. & finally wiped the laser with a cotton swab with the alcohol on. Could only see one actual lens though.
First couple of dvds attempted afterwards burnt much longer than before, Nero said they failed but they were playable. From then on I'm getting completed dvd successes. So thanks muchly.