Bridgend Youth Theatre is a highly regarded Youth Theatre based in Bridgend County Borough, S. Wales. This July 27-29 there is an opportunity for you to exercise your performance skills by playing in the orchestra for their production of the King and I. The backbone of the orchestra comprises professional musicians, as is the MD.
There would be no fee for this, but is a fantastic development opportunity. You'd need to be available for a band call, dress rehearsal and four performances including 1 matinee. Clearly you'd need to be a pretty decent sight-reader, although the parts I've scanned through don't seem too taxing.
If interested, PM me with your instrument and level of competency.