I'm guessing this is a long shot......but does anyone have a good beta/Volumex gearbox they are willing to part with?

Our problems up here seem to be getting worse instead of better....I now suspect a gearbox issue with my Volumex car.....might be clutch or linkage......or could be gearbox. With Stoneleigh looming I don't want to mess about and if it is my box, I likely wouldn't have time to rebuild it.