Possible light control module fault (part of headlamp switch) new ones are pricey and have to be coded, used ones can be fitted but they will put a 'tamper dot' on the dash as the module will not have same VIN as car. I have read that certain diagnostics can re-code certain year range modules.

Also BBA reman offer a repair service.

Doesn't 'coding' a new battery in only add the mileage and CCA rating of battery so it's charged correctly?