Freelander 2 service indicator after battery removal

[NotBenny]

Battery had to be disconnected from my freelander 2 for a cambelt change, and now the service indicator is reading approximately -2500miles on start up. It wasn't showing this before hand, and isn't over-due a service - was done in January (indicator was reset) and have done about 5000 miles since. I think (but will need to double check) that the "over-due" mileage is very close to the milometer reading over 90,000 miles, almost as it's defaulted to assuming it needed a 90,000 mile service.

Any ideas on how to restore the service indicator to the service schedule it had been operating on?