An advert for Norwich Union Insurance made in the 1970s featured 39 single deckers from different National Bus Company operators. Leyland-Nationals, Bristol REs and Bristol LHs were used:

The only registration plates identifiable from the Youtube footage I have seen is for Lincolnshire Road Car's 1033 (WFE678M), a Bristol LH6L/Eastern Coachworks, and Eastern Counties RL734 (YVF734J), a Bristol RELL6G/Eastern Coachworks:


The closing scene features an open top Bristol Lodekka FLF:


Chris Hough notes a Norwich Union campaign for personal insurance cover features occasional East Ender Ross Kemp almost mown down by a passing bus, a Dennis Dart/Plaxton of Imperial Coaches. It appears to be the one previously used in the National Lottery advert filmed in Uxbridge.