Don't forget it was Winchester from the 5th to the 12th centuries. 
Home of Alfred the Great, who by reputation wasn't a very good cook where he burn't the cakes, but no other controvacies are listed, so sorry, don't ask, I don't if he ran summer and winter cart wheels or summer cart wheels all year round.

Yes, and Colchester, although that was before the Romans created Londinium in about 50AD, which was destroyed by Queen Boudicca in 60AD, and quickly rebuilt. When the Romans left Britain in 410AD, London fell into rapid decline. It is believed the Anglo-Saxons started to re-inhabit parts of the area around London around the 5th century, but it was a period of mixed fortune for the later capital.
It was Alfred The Great, King of Wessex, centred on Winchester, that then made London part of his Kingdom in the 10th century after forcing out the Eastern Saxons, with his son eventually ruling from there. After the Norman conquest in 1066, William the Conqueror set about building the main part of the Tower of London to replace an earlier wooden fort. It was then that Westminster Hall was constructed, along with an early London Bridge. London then never looked back, and although various regional conflicts took place between claiming Barons claiming the throne of England, monarchs then carried on using the City as there capital, although living outside in castles such as Windsor (Henry I), or grand defended palaces such as Hampton Court (Henry IV - VIII), Richmond Palace (Elizabeth I - James I - Charles II). It was with Buckingham Palace, first used by George III, then from Victoria in 1837 that became the official residence of the British Monarch within the true London.
So London has has it's up's and down's, but is now the great capital of Great Britain.