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Hi Emma,
The use of the mullet indicates that the bearer is the third son of the current (?)  holder who is (probably)  still alive at the time the arms were recorded. (I say "probably" because the third son and his descendants may have opted to retain the mark on their arms to denote their connection to the senior branch of the family. There were/are no hard and fast rules on the use of cadency marks.)

I note the extract names the other families whose arms are shown but not this one. Is it related to the Buckleys of Buckley, who use "Sable a chevron argent between three bulls' heads cabossed Argent."? The use of the buckles  would then suggest they are "canting" or a visual pun on the family name.
Maec

Just a quick correction to an earlier comment : Ajax, like the rest of the Navy in WW2, was oil-fired.  Coal having been phased out during and after WW1.
So TJN's grandad would likely have been undertaking other engineering duties as speculated by Biggles50.

As a side issue : The changeover to oil firing gave rise to the power-politics of Middle-eastern oil, from which we still suffer today, and also contributed to the decline in demand for coal and the decimation of parts of the mining industry in the 1920/30s.

Test only

Shows the danger inherent in providing DNA to anybody without very clear security arrangements.
Is it coincidence that Ancestry were bought by Blackstones who have several Health and Healthcare companies in their portfolio ?  Possibly, but one needs to be careful : the information you give may end up being used against your children and their descendants.

A marvellous collection. Edwardian country gentry and their staff.

The photographer seems to have taken a holiday in North Devon.
QL-01 shows the port at Lynmouth with the original distinctive "Rhenish Tower" lighthouse. (It was lost in the 1952 floods and has been replaced with a modern replica.)
QL-02 is a view of part of Lynmouth from the mole near the Tower. The building in the background with the flag in front is an inn currently known as The Rising Sun and still flying a flag on its flagpole.

I suspect the rest of the QL group are taken in the Lynmouth area but do not know it well enough to pinpoint any of them.  QL-05 may be looking at the houses on Countisbury Hill.