Possible Clues:

• Gardener to the queen's architect perhaps?
• Ward nurse perhaps bringing glass, interrupted by doctor turning up
• Gardener presumably does research in the Land of Nod?
• Gardener works in hotel
• Hotel maid, at times
• College servant keeps obsolete money in cup
• Cambridge room servant
• College servant proverbially required to lie in his work?
• College servant putting foreign currency in mug