"Bike locks" is click-bait style misleading that BBC has adopted more and more.
Tubular tumbler locks.
I first saw them on computer cases in the 80s. They became popular (UK) on bike locks in the 90s as they were perceived as relatively secure. Then there was a famous hack where you could use a biro tube to open them - that would be around the time the BBC page says they stopped using those locks for nukes.
The same locks were used on filling cabinets and such.
You needed, we thought, a special tool to pick locks of this sort, until the "biro hack" came out (though I was young and didn't know about locks then).
