35k is not enough mileage to require a timing belt change.
But number of years might be a factor, how many years ago was it done?
A good mechanic when changing the belt will recommend whether to do pulleys & tensioners too depending on their condition but as mark says @ 100k miles they will most likely need changing so budget for them.
Drop Ciaran (RS RA) an email or pm, he's based in Dublin & a brilliant mechanic, as honest as the day is long so if he says they need changing you can guarantee they need changing. He's away on holidays for 2 weeks but if ya can wait I'd recommend you do.