Considering upgrading to pull-cord or water resistant wall switch. Heard those European style switches are safer due to different design (better sealing due to bigger surface area of the rocker).
The shock was felt stronger than ever before because of the humidity and water condensation on the walls.
Last time RCD tripped after 30 minutes of buzzing in the cooker socket (conductive parts too close to screw terminals).
 
Moisture inside the switch enclosure - sounds like a damp-proof course issue to me...had a very similar problem with a socket buried in a solid wall. There was so much moisture that the socket wall box had actually partially rusted away...and tracking across the face of the socket giving electric shocks!
 
Sorry but the pics posted just look like a wall and a switch to me. If you are getting shocks - turn the power off at the Consumer Unit (fuse board) and get expert assistance.
 
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Electric shocks from a light switch in the kitchen due to humidity, condensation
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