Fixed my door knock (adjusted striker pin - thanks Lumox), but this has revealed another occassional faint knock when changing gear!

Sounds like it's coming from the N/S front area (poss. CV, clutch, gearbox/engine mount?). It happens when Changing up through the box and accelerating and is just a faint 'tock' as the drive engages. If I make an effort to engage the clutch smoothly (as I usually strive to do), I don't get the noise. Any ideas...?

Could well be the lower 'dogbone' mount is a little weak