He has been correctly identified as Bernard Marmaduke, 16th Duke of Norfolk. However, he pays homage as the premier Duke, so the Duke of Somerset doesn't feature in the list.

I'll dig out the 1937 list but the 1953 list makes interesting reading, being undoubtedly both sexist and ageist!

Archbishop of Canterbury

Duke of Edinburgh
Duke of Gloucester
Duke of Kent

Duke of Norfolk
Marquess of Huntly (The Marquess of Winchester, aged 90, wrote in to say he was too old and infirm to attend, let alone pay public homage)
Earl of Shrewsbury
Viscount of Arbuthnott (The Viscount Hereford, aged 20, was debarred because he did not attain his majority until some months later; this despite the rules of majority being waived for the Duke of Kent, as they had been for the Prince of Wales in 1911. Viscount Townshend was debarred because he was also the Marquess Townshend. Viscount Weymouth was debarred because he was also the Marquess of Bath)
Baron Mowbray, Segrave and Stourton (The Baron de Ros was debarred because he was a woman. Baron le Despencer was debarred because he was also the Viscount Falmouth)

I suspect it will all be rather different next time around!