handbrake noise

Hello All, has anyone had or fixed this noise I hear when I put my evoque 2013 into park...not loud but can hear it squeak, its from back left side, just passed my Mot no faults, the noise is a bit quieter when roads are wet as if somethings got lubricated by the road water...thanks for reading this, and thanks in advance for any thoughts. Dave.

Update...noise reduced by 50%...sometimes as much as 95% . I carefully sprayed the electric brake actuator And put tiny drops of the spray on the clips on the caliper.