Elise S2 'Pinking noise' any ideas?

[SeanyD]

Hi all

I dont know if this is anything or nothing, but started to notice a subtle metallic 'pinking' noise coming from what sounds like the rear drivers side corner, also occassionally the front passenger side corner.

I know the Elise has rattles etc, so I'd be reluctant to book it in, but has anyone got any ideas what it might be?