Tapping noise under 2016 Ka Zetec

[GinoK]

Good evening,
First post about my wife’s 2016 Ka Zetec.

The car has very few miles on it (20k) but it’s developed a tapping noise which is coming from the rear near side corner. I could have sworn it was the exhaust touching something, a light (really annoying) tapping when travelling over slightly rough roads - not a knock. 
I’ve been under the car with a pry bar checking bushes for undue play, jacked the corner up and levered the wheel up & down to try to see any undue play anywhere in the suspension. Nothing appears to be standing out & I’m at a bit of a loss!

Any words of wisdom appreciated!

thanks in advance,

Gino