Ok so for those interested, I have found the source of all my problems. There is a metal bracket that holds the clutch pedal rigid to the firewall. One of the spot welds has popped off meaning there is not enough pressure being put on the master cylinder to enghe te clutch. Effectively the pedal goes a but sideways when pressed in. So, I may have replaced the master cylinder for no reason haha!
ANYWAY, I'm trying to find someone who has a welder I can borrow. The spot that needs welding is tough to access though! Will see how we go.