Just like Obama.
Via The Telegraph:
Jeremy Corbyn has defended not singing the national anthem the national anthem at the Battle of Britain memorial service by saying he had chosen “respectful silence”.
The hard-left Labour leader remained solemn, but silent, as he stood in the front row at St Paul’s Cathedral on Tuesday.
Mr Corbyn had turned up on foot for his first official engagement wearing a mismatched jacket and trousers with his shirt unbuttoned at the top.

