Sand from the Sahara sweeps into Kilburn?

• AFTER last Wednesday’s pouring rain the streets and gardens (and my bike) here in Kilburn were left covered in a dusty yellow residue.

Has anyone analysed this to assess what it is and where it came from? I would be grateful for some reassurance.

CATH ATTLEE
Fordwych Road, NW2

Editor writes: We’re told it was sand from the Sahara.