An unexploded device found washed up on Winterton beach was blown up in a controlled explosion today.

During the afternoon of January 3rd, a member of the public alerted the local coastguard after encountering a suspicious item lying in the sand.

Click here to see a news article covering this incident.

Blacker spigot mortar WWII
The part weathered anti-tank mortar bomb with a radio for scale
What was the UXO item?

The unexploded munition appears to have been a Blacker Bombard mortar bomb of WWII vintage.  The Blacker was a 29mm spigot mortar  fielded almost exclusively  by the Home Guard. This example will have been either the 20 lb anti-tank or 14 lb anti-personnel bomb.

There are two explosive hazards with these munitions. The main high explosive charge in the bulbous head and a second propellant charge, albeit smaller, in the base.

The British Army considered the Blacker mortar to be a weapon of poor accuracy and range. However, during 1941 when it was introduced, the army had few alternatives in their arsenal. It soon became unpopular with the infantry units it was assigned to.

Blacker Bombard mortar
British Home Guard soldiers training with the Blacker Bombard spigot mortar
Why did it wash up this beach?

During 1940 and 1941 British soldiers were concentrated around the south-east coast, in anticipation of a German amphibious invasion from occupied France.

As a result, associated unexploded ordnance finds are more likely at beaches where a heavy military presence persisted throughout World War II. Soldiers often used the sea as a firing range and consequently, associated  UXO contamination of the coastline was inevitable.