galaxy150

Hello, a bit of advice would be welcome. I have a 2006 tdi 150 6spd last of the old shape. I have had it for 12 months and have done 40000 trouble free miles, but last night stopped on a slight hill and when I pulled away noticed a whining noise, more audible in first and second. Whilst it is not very noisy, I noticed it immediatly. The car has now done 80000. Any ideas? cheers mark