Err...I couldn't do it - I didn't have a spanner big enough (embarassment). I think I'm gonna wait until next service and get it done then. I have to say that the brake lights seemed to work a bit better today - maybe there is still some air in the system
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On the better side - I replaced some leaking fuel hose between fuel pump/carb and carb/carb and now the mpg has gone up - obviously!!