Alex Partridge tweeted to say he was "delighted" to hear leads were being followed up on the missing medals but pleaded with the public to get in touch if they knew anything.
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Mancunians have come together in defiance after a suicide bomber killed 22 people at a concert.
Extra armed police will be deployed to Wembley and Twickenham this weekend, police have confirmed.
Sir Roger was the son of a police officer from Lambeth who grew up to become one of the most successful actors of his generation.