Storage of diesel tankers on boundary fences

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Our neighbour next door to our commercial workshop has placed a diesel storage tank(approx the size of a truck tank) on our boundary fence. Its OK for him as its a long way from his buildings but it is only two metres away from our workshop! We are not happy with this and I can't seem to find any information on storage requirements.I can't imagine it would be legal to store diesel so close to a building.Some advice would be most grateful. Thanks Christine