campag chorus alignment and adjustment

Dear All
I have recently changed to Campag and generally am impressed. I wonder if anyone can point me to a youtube clip or a webpage that gives me instructions on how to align it properly.
I’ve recently taken the bike in a bag abroad and its not quite as good as it was.

As an backup, Is there a mechanic in London who is a specialist in Campag. It would be great to get it running perfectly and if I can’t do that I might have to take it in.

Thanks in advance

Andrew