Some 20,000 officers from 43 police forces across England and Wales, including the Midlands, are expected to attend protests in London today.
Shadow Home Secretary Yvette Cooper says the numbers of people attending demonstrates the concern that many officers are feeling.
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Pioneering technology allowing 999 callers to stream live video footage to emergency crews is being developed by Midland firefighters.
More than 700 foreign crime suspects have been arrested after Birmingham became the centre of a Europe-wide police operation.
Cloud will thicken with some, mainly light, patchy rain possible through this afternoon and into tonight, with some clear spells.