Catalogue of Works
The only Betty Roe musical which has a full set of (modern) performance materials is The Barnstormers. This was recently re-typeset and published by Novello with a CD of backing tracks etc. The Janice Thompson Performance Trust did an excellent performance of The Barnstormers in 2012 and all the participants (with a fairly wide age range) seemed to thoroughly enjoy it.
Destination London (a "mini-musical")
With libretti available for;
Crowds (plus a chorus part)
However, much of the performing material for all these works (full scores/instrumental parts etc) is still with the composer.
Mistress of Charlcote Park
The Musical; The Magic Fishbone, based on a story by Dickens, is yet to receive a staged première (selections were performed in Southampton in June 2010). This is quite a challenging piece and would be for 6th form/college students or an operatic society. An interim edition (complete libretto but with three musical numbers yet to be composed) is available from Robish Music for anyone considering a performance.