I found this in Wikipedia:

'The Anglo-Saxon monarchs used various locations for their coronations, including Bath, Kingston upon Thames, London, and Winchester. The last Anglo-Saxon monarch, Harold II, was crowned at Westminster Abbey in 1066; the location was preserved for all future coronations.
The basic elements of the coronation ceremony have also remained the same for the last thousand years; it was devised in 973 by Dunstan.
When London was under the control of the French, Henry III was crowned at Gloucester in 1216; he later chose to have a second coronation at Westminster in 1220. Two hundred years later, Henry VI also had two coronations; as King of England in London in 1429, and as King of France in Paris in 1431.'

Not, perhaps a very scholarly source but I can't find anything to differ from it.

Charles