The new Police and Crime Commissioners (PCC) will take office today, replacing the Police Authorities.
The PCCs were elected last Friday and will oversee the work of their police forces, set the budget and have the power to hire and fire the chief constable.
Many of the commissions were elected despite poor turnouts in the region, some as low as 10%.
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Tuesday afternoon's forecast for the west of the region
Tuesday afternoon's forecast for the east of the region
Forecasts show around 480,000 people are to move through Gatwick airport over Easter period.