Flag and anthem of the Prince of Ranham-upon-Thames (fiction)

The coat of arms of Grantham stands on a Bourbonic-flavored white flag. In background his march, taken from the "Semionovsky regiment". (Yes, I do know that the march has been composed 150 years after the English civil war.) You can guess that all this is a joke on Matteo Renzi from Rignano sull'Arno.