Finding Home Guard defenses after the war

Was a large fuel device among the Home Guard's proposed defenses?

Fuel-based devices were among many ideas; the follow-up stresses the postwar difficulty of finding and clearing improvised defenses.

A question about a fuel device leads to the many defenses devised locally by the Home Guard. Its precise name is unclear. Finding where such measures had been buried became a major postwar clearance problem. The scale of that work is recalled without a precise duration.