Just been out to start the car (gti 2.0 8v) and theres a squeeling coming from i think one of the pullys. as you look down the left of the engine its the very left outer bottom one furthest to the back and its looks wobbly as it spins

ive got the car booked in on saturday for new cambelt and tensioner,which one is the cambelt and should i have the other belts done at the same time as the one right at the top is looking a bit cracked anyway.
Hope somone can make sense of this, its all new to me im afraid. Cheers, Dave