The route from Westminster Abbey to Buckingham Palace in 1911 according to Wikipedia ” Following the coronation service, the three processions returned to the palace in reverse order and by an extended route, passing through Pall Mall, St James's Street, Piccadilly and Constitution Hill.
The route from Westminster Abbey to Buckingham Palace in 1937 according to Wikipedia ” In 1937, this return route was extended significantly.[40] From Westminster Abbey, it passed around Parliament Square and up the Victoria Embankment (where 40,000 schoolchildren were waiting)[40] and then along Northumberland Avenue, into Trafalgar Square, up Cockspur Street through to Pall Mall; from there, the procession went up St James' Street, joining Piccadilly, then up Regent Street, then west along Oxford Street, before turning past Marble Arch and then down East Carriage Road, alongside Hyde Park; from there, the procession passed through Hyde Park Corner and then through Wellington Arch, on to Constitution Hill and then back into Buckingham Palace.[4]
The route in 1937 was 9.7 kilometer…
And in 1953 ” The return procession followed a route that was 5 miles (8.0 km) in length, passing along Whitehall, across Trafalgar Square, along Pall Mall and Piccadilly to Hyde Park Corner, via Marble Arch and Oxford Circus, down Regent Street and Haymarket, and finally along the Mall to Buckingham Palace”
It will be interesting to see wich route Charles chooses… I don’t think he will go straight back home from Westminster Abbey via Whitehall, Horse Guards Parade and The Mall - but i also can’t imagine him wanting to sit in a Carriage and wave with the Imperial State Crown on his head for almost 10 kilometer like his grandfather…