just to clarify my position on this subject,
when ever we have moved home over the years we have always started ,more or less from scratch , with birds from friends that have been gifts...no paperwork whatsoever just decent flyers saying "ive got some youngerns for ya " .
and we have found that we are able to hold our own with these birds.
a good racer is a good racer no matter what its out of, we have bred multiple winners from a stray hen we caught in the grounds of church !!