Earlier on there was a bus being [towed] on the M25 with a very broken
upper front. ... showing blinds - route 10 to Euston. ...

That would be extremely odd - route 10 runs between Hammersmith and
King's Cross, and doesn't pass underneath any bridges on the way.

When an airliner crashes but isn't totally destroyed, the airline
often tries to paint over their logos before they get shown all over
the news media. Perhaps the driver of this bus felt that he had to
similarly protect his route's reputation, and changed the sign!

(Just kidding... I think...)
--
Mark Brader, Toronto | "It is one thing to praise discipline, and another
| to submit to it." -- Miguel de Cervantes, 1613

My text in this article is in the public domain.