Uhh... That wasn't Nick's tune. It's been fiddled with after it's left Nick.
And he doesn't owe anyone shit. Andrew bought the motor (Eventually) after he inspected it himself more than once.
Those timing belt wasn't put on by Nick either... Nick put the new head on, yes, but it was taken off again after purchase. more than a year ago.
So why blame Nick for everything when, in the 1 year + its been out of his hands, somebody else has fiddled with it?