Unfortunately after driving a bit more my brakes went back to being poor, so after triple checking all the pipework I decided to replace the master cylinder. After a bit of searching, I found one that was the right bore on ebay, and it was chrome as well so will look pretty. After bench bleeding it, I fitted it and started bleeding again. The rears were perfect, but I could not get the fronts to push out much fluid with the bleeders open. I re-bled the master and gave it another go but still wasnt moving much fluid at the front. A quick test and I could lock one of the fronts, and the car stops better than ever but I'm not convinced they are working as well as they could. A check of the pin to master distance with some play-doh showed it to be about a mm out so I'm at a loss what can be doing it now. I'd well and truly had enough of messing with brake fluid, including emptying a container over myself coming out from under the car, so decided to have a tidy up of some of the loose wiring instead. I cut the fuel pump relay feed down to the right length, and gaffer taped all the rear loom down. I did the same inside the car and re-connected the reversing lights while I was at it. I also made a bracket for the inner wing to hold it in place as it was missing and did some general tidying up. Not exactly a great day but I'm getting somewhere at least.