He went on to discover a passion for jazz guitarists Wes Montgomery, Joe Pass, Pat Metheny, John Scofield, Larry Coryell, and Tal Farlow.

He has worked as George Russell's guitarist, recording with him on several occasions, and with the Creative Jazz Orchestra, Arild Andersen, Tim Berne, Anthony Braxton, Jacqui Dankworth, Tal Farlow, Bill Frisell, Dave Holland, Vince Mendoza, Bob Moses, Palle Mikkelborg, Mica Paris, John Taylor, Mark-Anthony Turnage, and Norma Winstone.

[3] He wrote a suite called Ropes that was performed by a 22-piece orchestra, a jazz quintet, and Adam Nussbaum on drums at the Royal Northern College of Music in Manchester.

[4] Walker's sextet includes Les Chisnall, Iain Dixon, Malcolm Edmonstone, Pat Illingworth, and Steve Watts.

He has taught a music summer school in Altrincham with Iain Dixon, and has been a tutor for the National Youth Jazz Collective, in addition to teaching guitar online.