No matter what Seat say, especially on a 150 that's BOUND to have been driven hard in its tme, I personally wouldn't leave a cam belt any longer than 35-40K.

£200 for a cam belt, and a hell of a lot more if it snaps......................

Mike
 
Depending on the engine number it will be 60 or 80k and four years.

So if you edge your bets on 60 then you will be safe.
 
intervals

intervals for leon pd150 timing belt is 4 years or 80000 whichever falls first i would be tempted to change the belt at 60000 myself .change water pump and auxilary belt to,main dealer price is 370 for pump belts and labour.hope this helps