OK, well just got the repaired laptop back working as it should.
Cost of repair was £69.99 + £10 return carriage. Turnaround was about 2 days at the far end. Guarantee for 180 days. If not fixed the £69.99 is refunded.
Early days, but 100% satisfied so far, and much better than Dells offer of £366!
This company does other machines as well as the M1330 if anyone has a similar problem.