Finally got some time to install the new brake master and it's working perfectly. It bled the cylinder as expected this time and and I bled both the rear brakes with the expected flow of fluid. I ran out of time last night so will finish bleeding the fronts and clutch tonight. I've also borrowed a soldering iron and I'll connect my AFM wire back to itself tonight too. If she starts I'll post a vid to prove it.
On another note, does anyone want a set of 15x7" 'mesh' type wheels?