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Sorry I didn't finish answering your question, the servo vacuum hose is just £15, I checked, it's worth replacing anyway as the rubber might have perished a bit or the check valve degraded. If that doesn't improve it then you can start investigating other things. If it makes it a little bit better but not totally, it's worth replacing all the vacuum hose in the engine bay, again it's cheap, but can be a bit time consuming.
You can contact Roddison Motorsport direct, or Bofi Racing do them here:
https://bofiracing.co.uk/brakes/brake-pads/
With brakes, here's some quick checks:
If you press the pedal and the pedal feels firm but nothing happens no matter how hard you press, generally that's a pad or disc issue.
If you press the pedal and it's long and spongy, that's a fluid/brake fluid hose issue.
If you press the pedal and it feels like nothing happens but if you really push hard the brakes work well, it's a brake booster/servo issue.