Every Little Helps

Actress Prunella Scales appeared in a number of Tesco adverts. Sadly we only see the interior of the bus in this 1999 example, but unusually it's not an RT. Note the blue interior and dark blue seats:

Tesco Visa Card

One of a series of Tesco advertisements starring Prunella Scales and Jane Horrocks shows a coach trip to a stately home. The coach is two-tone blue but not shown clearly.

Sullivan Buses DT4 (G504VYE, Dennis Dart/Duple Dartline) features briefly in a 2004 ad in the same series with Prunella Scales. (thanks Dean Sullivan)

Hairbrush Divas

This ad for a compilation music CD features a woman singing on the upper deck of a London Metrobus.

Tescocompare.com

A 2008 ad featuring diminutive magician Paul Daniels also features Sullivan Buses VPL174 (X157JOP), a Plaxton President-bodied Volvo B7TL. (Thanks Dean Sullivan)