If it's got an ap paddle clutch in it this could be your problem, I've got one in mine & the car normally judders when pulling away / changing gear etc & makes a funny whining noise when changing back down through the gears as well which constantly gets taken the pi$$ out of by me & the other half

If it's a standard clutch you've got when was the last time it was changed ? if it was recently may be that it wasn't correctly lined up when it was placed against the fly wheel.

HTH