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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Emergency services were alerted to the crash at 3.50pm on Thursday, Sussex Police said.
WARNING: Some people may find some of the images in this report distressing.
Medical staff who helped during the Westminster terror attack have received a royal thanks for their life-saving efforts.