Cat Food, Polistirene Boxes, etc (Stoke Newington N16)

I'm collecting for a Local Cat Colony

Wet and dry Cat Food with no Cereals or Grains or Sugar
&
Cube Polistirene Boxes 40x40 and straw
&
Clean Second Hands or New Covered Cat Litter Boxes
&
Litter Sand

needed for a Cat Colony Management.

Thank you so much

PS: Please do not worry, the Colony is looked after already, the one who manages it just needs more support and Vet Attention is being provided.