How many revenue staff does LU have? Besides seeing them sometimes with the police and sniffer dogs at stations like Old Street, Farringdon, Aldgate etc (anyone would think everyone going to/near Shoreditch is a drug user!), I've probably seen them on trains and stations about twice in my 18 odd years of travelling.
Oh, and a few in a team that jumped on the 'Seventy-Free' bendy bus once.
Oh, and a few in a team that jumped on the 'Seventy-Free' bendy bus once.