I bet it does have a sign that says 'Welcome to Luton'.
Maybe you didn't see it because you were preoccupied with the junkie? Is there anyone who can confirm whether or not there is a sign that says 'Welcome to Luton'?
( JessAction Give me all your expensive brandy and hubcaps., Mon 8 Jun 2009, 20:43, archived)

There are at Luton Airport Parkway but I've not been into Luton Central for a while, I don't remember

( Fluzzy namby-pamby pudding and pie, Mon 8 Jun 2009, 20:46, archived)