I'd reject that bike and have it replaced. If its been clunking, slipping, grabbing and generally banging its transmission about, its longevity may well be compromised.
Even so, Graham, I still don't think someone wishing wholesale redundancy on a nation (his own nation, come to that) is 'acceptable'. Far from it, actually.
Don't like the sound of this 'thick oil' business. Sounds more like a 'thick mechanic' to me! You need to find out exactly what they put in there. And if it's not 100% to specification then they have serious explaining to do.
Hmmm, and again it all comes down to 'racing'. OK give race bikes chains and road bikes belts - simples - but NO! Road riders want what racers use! And the whole thing goes round again..
(Goes round again chain? Belt? Goes round again? Oh, please yourselves..)