Waterpump Rover 45 1.8 2001?

Hi There
RE: Rover 45 1.8cc 2001. K series Water pump replacement
If I were to replace the water pump following manual instructions and not interfere with the timing belt position on the other gears is that in order or must I reset the timing? At present I’m not sure if it has a (manual or auto timing belt tensioner) The belt has done 30000mls.
Please advise of working life of the Timing Belt Mileage
Many Thanks
Colin Luxton