My Dear Good Life,
Wonderful to hear of someone else who appreciates the excellent Cotswold by Dukes of Pall Mall. It is certainly one of my favourite citrus fragrances. Some years ago I had a bottle of it in cologne form - even nicer. Now all I have is two bottles of the aftershave, but even Cotswold aftershave seems to have disappeared from the face of the earth.
I suspect the company Dukes of Pall Mall has now gone out of business, so like so many small fine perfumiers. As for the mythical Belgravia by Dukes of Pall Mall (erroneously identified as 'Grosvenor by Dukes of Pall Mall' by the Baron de Charlus in a recent review on Etienne Aigner), I have only ever heard of it, never sampled nor even seen a bottle of it advertised.