[Lio]

Not always. Fly tipping is an unwanted problem. Most people would prefer you take it to the dump.

I suspect might be one of those regional things like scone/scone[1].

1. It’s pronounced “scone” and I will fight anyone that says otherwise!

[rprwhite]

As a less confrontational reply: from my point of view “unwanted fly tipping” is talking about rubbish. The concept of depositing unwanted, yet usable, not rubbish, things somewhere is not something that would happen (outside of the rather recent disposable culture context). As to your sentence (which is perfectly fine), the use of words avoids possibly confusing repetition. Atypical use would be preferred to “no fly tipping, take it to the tip”.

[rprwhite]

Challenge accepted - “scon” is the only way! Why? Absolutely no logical reason, but it is, how it is.

[Lio]

"Scon" is, of course, how "scone" is pronounced by all right thinking people but it does somewhat ruin the joke. ;)