I have an odd clickety chirrup grasshopper type noise
It seems to come from the passenger side footwell/dash area
It is not related to engine speed or road speed or road bumpiness, it's also there on tickover
It's hard to describe but it's sort of a chirrup
It chirrups, then it's quiet for a while, then repeats
A bit like half a dozen metallic playing cards being riffled
or
Like flicking an old fashioned set of feeler gauges
or
A bit like a metallic slow chirping grasshopper
If the radio is on you can barely hear it
It always sounds exactly the same
The gaps between chirrups appear random - but always more than a few seconds

pump? relay? sensor?

Anyone please?