By Kate Holton LONDON (Reuters) -Britain said on Monday it will force ferry operators docking in its ports to pay the minimum wage as it stepped up pressure on P&O Ferries to rehire 800 workers who the company fired without notice in favour of cheaper staff. P&O, which is owned by Dubai ports firm DP World, said it had decided to break the law and fire workers on the spot so it could instead hire cheaper agency staff after losing 100 million pounds ($132 million) last year due to COVID-19 curbs. The Conservative government of Prime Minister Boris Johnson has condemned the move, which has shone…