Photo is from Royal Opera’s 1991 production

https://www.bbc.co.uk/programmes/m0017ml3

In this R3 recording (5/2014, Barbican), Martyn Brabbins conducts the preferable original version; when Royal Opera revived Gawain the composer was required to make cuts to avoid overtime payments for the orchestra.

http://www.colinscolumn.com/martyn-brabbins-remembers-harrison-birtwistle/