In article . com,
(terzal) wrote:

I thought there was an injunction against horn use after a certain
time.
10:30 pm sounds familiar.

Have just found a site with a list of exemptions applying to emergency
vehicles. The use of audible warnings at night is one exception from
the Road Traffic Act..

http://www.bespokedrivertraining.co....egislation.htm

I never doubted it wasn't illegal. We were discussing when they were more
strongly encouraged not to use sirens.

--
Colin Rosenstiel