Oh lots, yes. The damned things are so expensive to run. That's the problem.
Let's see, you could get 4 liberals in a Jetranger, climb to a thousand feet and drop them out, that's going to cost a couple of hundred quid, at least 50 quid a liberal, I don't know if they're worth that.
Think of the salutary effect it would have on all the other liberals, though. Imagine you're there on your University campus about to protest the failure of the government to simply give you a living or whatever and a screaming Owen Jones plummets to earth and turns into hairy raspberry jam right in front of you. It's going to give you pause for thought at least, isn't it?
If it is a verbal warning then the officer will make a note of the incident and then update the forces control room of the outcome in order for the incident to be closed on the record. This indicates that your name will appear on a computer record held by your local police force and this will appear on CRB checks (or DBS checks as they are now).
Still sounds similar to an official caution to me.
I was cautioned as above around 1994 for possession of controlled substances and after being arrested, held and interrogated in Margate Police Station I was released without charge but officially cautioned, informed accordingly that said incident would remain on record, which it did.