New, odd noise

[Audidothat]

Hello all

Was parked next to a wall today with the window down and noticed an odd, warbling, fluctuating, intermittent, quick noise. It isn't related to the power steering and doesn't seem rev related.

Sorry for the poor video quality but you can hear it, (ignore the ticking, I think that is the fuel lines, right???). When I put the phone into the wheel arch, I fortuitously manage to catch it instantly stopping, so it is something that switches off.....
It is only audible on the near side.

Any suggestions/ comments etc greatly received. I don't have vagcom so will need to book it in somewhere to see if a code had been thrown up. Car is driving normally.