I suppose we could have taken them to the small claims court? Though the kit is worth more than £300, the principle should surely have counted for something, and it should have scared the living nonsense out of the company...
The Medical Devices Directive while sometimes a bit confusing actually might have something in it that would help. I just need to read it through without falling asleep!
I have found another potential sound level meter to consider - the Casella CEL621C1 (USA) from
www.keison.co.uk. Any more ideas guys?