- 3 updates
The officers are protesting against proposed changes to their pay and conditions.
Some 20,000 officers from all 43 forces across England and Wales are thought to be taking part in the first police march in the capital for more than four years.
Up to 16 thousand off-duty police officers are set to march in the capital against cuts to the force. They'll don black caps for every police officer lost under the Government's budget cuts.