Know of any good beginner Guitar or Banjo lessons/teachers in South Kensington area?

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Know of any good beginner Guitar or Banjo lessons/teachers in South Kensington area? I have 2 boys, one in Reception the other in year 2 who'd like to start learning the guitar or banjo. Does anyone have any recommendations on teachers, classes etc?

Go to Chimes, the music store near the south ken tube station. There is a bulletin board with musicians who give lessons just outside.