The majority of UK Police Forces use Mercedes-Benz Sprinter vans, commonly referred to as 'Carriers', as standard transport for PSUs.
A notable exception is the Police Service of Northern Ireland, whose Tactical Support Group officers famously use armoured Land Rovers.
The Metropolitan Police's Territorial Support Group also maintains a fleet of armoured Ford F450 based Jankel Guardians[1] for use in serious public order situations, like the 2011 England riots.
Standard kit for PSU officers consists of a transparent acrylic riot shield, a baton, a visored 'NATO' helmet, shin and elbow guards, along with fireproof coveralls when required.
Their compliment includes officers trained and deployed in Constable, Sergeant and Inspector roles, along with qualified PSU medics.