PCSO Terry McCormack, who chased down suspect after suffering a broken ankle, said he was doing what he was "paid to do".
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Mark Cullen's late winner seals the points for the Hatters after Tom Naylor sees red on his Cambridge debut.
More than 200 British paratroopers from Colchester-based 16 Air Assault Brigade jumped onto fields used 70 years ago by troops.
Mainly dry on Sunday in the Anglia region with some good sunny spells. One or two light showers are possible near coasts.