Buses, coaches, & lorries

UK PROFESSIONAL DRIVERS FORUMS OLD TIME LORRIES, COMPANIES AND DRIVERS (INTERACT
1392

Buses & Cops Trafalgar Sq 1972.JPG
Buses & Cops Trafalgar Sq 1972.JPG800×600 114 KB

I took this picture in 1972 close to Trafalgar Square. Any idea concerninig the make and model of the coaches on the right?