Sometimes you don’t need to seek interesting machines out.
Passing the bike bay at work today I came across this lovely little BSA Bantam in army post office livery.
It was obviously well used and had marked its territory in the usual way of old British bikes by depositing a few spots of oil onto the ground underneath the gearbox.
I have no idea who owns it, or if it will ever be back, but it quite made my morning.
Edit: a wiser man than I has identified this as a 125cc D1.