Finally got around to changing the brake fluid at my cars next service.

I followed the instructions in the link above.

I held the trip meter button when I turned on the ignition, I then got a service indicator with the number of litres left till the next service. I then quickly pressed the reset button and the next display had the number of days (negative) since the brake fluid warning light came on.

I then held the button till the word reset flashed on the same info, then pressed it again which confirmed the reset and set the warning back to 730 ( or similar) days.

Brake fluid change indicator has now disappeared.