Hollycroft Av, Forty Av, Wembley Hill Rd, Park Lane, High Rd, Harrow Rd,
Bridgewater Rd, Barham Cl.

although streetmap may have not shown some footbridges or alleyways.
They usually do though. I guess there are no footbridges that either
let you use Barham Park as a shortcut or cross between St John's Road
and Lancelot Road.

Edgware Road to Marble Arch then along Oxford Street.

Unless you cut diagonally across Regents Park.