Anyone got any ideas what this could be in 1st and 2nd while accelerating normally not heavy load there's a ticking noise then it stops in 3rd onwards

Is it loud, does it do it from cold and goes away when warm ?

Only taps in gear and moving?

Stone in your tyre, overcome by road noise at higher speeds??

Sent from the moon using telepathy

Only in first and second there when warm up and cold only makes the noise when under aceleration otherwise the engine is quiet 

Damaged gears? Or maybe even something wrapped around one of the driveshafts? Bit of an odd one

Could it be a exhaust blow from the manifold ,upipe or turbo flange ?

Have you checked the gearbox oil levels ?

Could try changing the tyres from front to rule out wheel noise and while the front wheels are off check cv's for wear

If it's not broke .....upgrade it 😊