tournedos:
There will always be people who think it makes a difference...
Oh, and they do ... when your credit card statement arrives.. 
.. and being a bit dim - I really don't understand this statement...
"The leads were taken in part exchange so have been well burnt in.."
Exactly how the Dickens do you 'burn in' a Fig-8 mains cable - and how noticeable is the 'performance' of a fresh one as opposed to one that's been 'burnt in' ?
It's a sodding mains cable !!!!!!!! 
Sorry - i'm getting a bit carried away here. My apologies....
BeoWorld - Everything Bang & Olufsen