Andy Summers - Lecturer in Electrical Installation at TradeSkills4U, Warrington, Cheshire. https://www.tradeskills4u.co.uk
See also Transposition Part 1 and Part 2 at https://www.youtube.com/watch?v=UsMv7_Dg9-U and https://www.youtube.com/watch?v=7IXkJCfhNXI
