Ian Jelf gurgled happily, sounding much like
they were saying:

I've been meaning to ask this here for ages, if not *years*!

What are those orange and yellow "target" like things one sometimes (but
not always) sees on the front nearside wing of London taxis?

I've always assumed they signify that the cabby's a member of one of the
phone-a-cab networks. BICBW.