Yitzak wrote:

Hi I have a corridor like cellar, with a concrete floor which has
broken in many places exposing damp dirt floor. This means I always
bring dirt back upstairs when I come back.

The best plan would be to dig it up and put a damp proof course etc.

As I really don't use the cellar that much I would love to lay a "mat"
with holes so that the floor can "breath" and more importantly not
smell once it had been down there for a while.

Any ideas for the right product..

Why do you want the floor to breath? The cheap solution would be to
put down outdoor carpet, the kind that has a grass like texture which
you often see trailer campers use under the awnings. Other wise put
down 4 mil plastic and on top of that put 1/2 outdoor plywood. Or you
could just use those fit together floor pads for shops (they have
holes and come in bundles of about six 2'x2' squares.