By Antony Clements-Thrower Tens of thousands of XL Bullys continue to prowl Britain’s streets despite the Government’s ban – more than five times originally believed. Documents from the Department for Food and Rural Affairs (Defra) show owners registered 55,000 of the dogs before the February 1 deadline for an exemption certificate. As of that date it is a criminal offence to own one of the animals without the document. The number is around five times that the Government is believed to have existed in this country, according to the documents obtained by the Sun. It follows restrictions which c…