They are likely to inform you that the belt doesn’t need changing until it’s covered in excess of 125K miles, without any specified time limit. The car you intend buying is now approaching 9 years old and has covered just over 3k miles a year on average.
When you say it has service history, has it been serviced annually? If it hasn’t, it hasn’t been serviced properly.
Whereas low mileage appeals, it has to be considered that vehicles are likely to have been used on short journeys, with stops starts ( where the belt will be stressed) and increased wear on clutches etc., and can potentially be as worn as a vehicle which has covered treble that mileage operating under optimum running conditions on the motorway.
It’s obviously your choice John, but by previous recommendations on time limits, the car should already be due for its second belt change as it approaches 10 year old.
I my book, there isn’t any debate, and I would be changing it now, to minimise the risk of it being rendered beyond economical repair should the belt decide to part company.
As Richard says, renew the auxiliary belt at the same time. In case it helps, I use Gates belts and tensioner kits.
Regards,
Gareth.