"Roger Tonkin" wrote in message
...
Depends to a certain extent on when and how the path was laid.

The slabs were laid onto sand I believe, and a dry mixture of sand and
cement brushed between them (which has mostly eroded, hence how the water is
able to drain between). The slabs were laid over 10 years ago by my father
and this has always been a minor problem.

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Best Wishes
Simon Taylor