Venatore - my fault, I clicked on the link without reading the LARGE GREEN writing!! Nothing wrong with your sig.
3Jane, good suggestion; here is what I found.
During the First and Second World Wars Trinity House's lights remained off, but they were occasionally relit for the use of Allied shipping and fleet movements.
Wartime risk
Turning off the lights in wartime was a risky business. On 28 October 1915,HMS Argyll was wrecked on the Bell Rock.
Bell Rock lighthouse during a storm from the north east. © NMM
The Bell Rock light had been turned off as wartime custom demanded. But the light had been requested to be turned back on for the Argyll. Due to some hitch it was not put on until it was too late.