Doctor in the House S05E08 - In Place of Strife

Painters arrive to decorate the ward and, as they are in white coats, Duncan mistakes them for new students. The painters do their work but go home at five, leaving a bare patch, which Duncan paints in. Next day the irate painters down tools in protest at his non-union interference. The doctors put the furniture back in place, causing the porters to also down tools. Soon all the hospital's manual workers are on strike so Sir Geoffrey suspends Duncan to appease them. This causes the doctors to go on strike.