If anything, I would think the British Empire's decline is happening at light-speed compared to the Spanish Empire. But as far as size and scale, that is perhaps a fitting scale - though a lot will depend on how things play out in Africa. The main issue at this point rests with the increasingly troubled relationship between Britain and its Dominions. Canada is distancing itself, Australia is at once terrified by the growth of Japanese power and furious at the British squandering of the Dominion Fleet, New Zealand is turning inward as it goes into a downward paranoid spiral, South Africa has always been independently minded and is only growing more so while India is just about set to explode. The African colonies have been ravaged by the wave of famines during the early 1930s, but still lack the sort of cohesive social and national force necessary to pull free of the British, but when we get into the 1940s and 1950s, that is likely to change significantly. Whether the British can keep hold through such developments will be one of the things that will be fun but so fucking difficult to research for.Is the gradual decline of the global influence of the British Empire ITTL comparable in size and scale etc. to the decline and eventual downfall/dissolution of the Spanish Empire in the 17th, 18th and 19th centuries?
Furthermore, are the Victorian and Edwardian eras in Britain looked back on fondly as some sort of a Golden Age domestically?
I mean weren't they (Victorian-Edwardian Eras) looked upon like that IOTL until well after the Second World War? Nostalgia for the pre-Great War era is a staple of most conservative movements around the world ITTL, though not all.