After the first world war the WDs once again embraced new technology, becoming an armoured car unit at a time when many yeomanry units were determined to remain mounted on horses.

It was at this time that the Regiment formed its link with the Royal Tank Regiment, becoming the only other unit in the British Army to wear the black beret to this day.  The two units worked closely together in the interwar years as new armoured tactics were developed, a relationship which continues in the 21st Century in the formation chemical, biological, radiological and nuclear reconnaissance role.

Just before the outbreak of war in 1939, the Westminster Dragoons became an Officer Cadet Training Unit, with over 90% of pre-war WDs gaining their commissions and transferring into units throughout the British Army before the WDs reverted to an armoured role in 1940.

Among them was Captain Pip Gardner VC MC (right), who transferred to the Royal Tank Regiment and went on to win the Victoria Cross for saving the life of a badly wounded officer of the King's Dragoon Guards whose armoured car was out of action and under heavy fire.