'I always knew this vehicle as a Scimitar. Do the British have a different name for it?'
The Sabre and Scimitar are very similar - the Sabre is actually the turret of a Fox combat vehicle mounted on a Scimitar chassis - it still has the Rarden 30mm cannon, but has a 7.62mm chain gun mounted in place of the GPMG on the Scim.
http://www.army.mod.uk/equipment/av/av_sab.htm
Anyone who has travelled near the Bovington tank traning grounds will be familiar with these. One minute you are pootling along a quiet Dorset country road and the next minute 4 of these burst out of the hedge and zoom across the road without looking or stopping!
Caution - Tank Drivers under Instruction
Precisely what other road users (I was on a bicycle!) were expected to do when confronted by an incompetently driven tank occupying the entire width of the road was unclear...