(Reuters) – British Prime Minister Boris Johnson on Friday told Turkish President Tayyip Erdogan that Finland and Sweden would be valuable additions to the NATO alliance. A spokesperson for Johnson said the PM also asked Erdogan on a call to work with Swedish, Finnish and NATO counterparts to address any concerns ahead of a leaders summit in Madrid next month, and said the UK stands ready to support. The UK PM and the Turkish president also agreed to work to unlock supply routes for Ukrainian grain stocks and alleviate rising global food prices, the Downing Street spokesperson added. (Reportin…