Two Silly Signs

We had a day out in Harrogate today, during which I saw two signs which confused me a little.

Firstly, en route there was a sign which read "For Wetherby Follow Existing Signs". Which got me wondering what the possible alternative courses of action were? Attempting to follow signs which had once existed but did so no more? Or perhaps following signs which did not yet exist, but would do so at some future date? Most strange.

Secondly, in the town centre, I noticed a sign on a lamppost which read "Anti-Social Drinking of Alcohol In This Area Restricted". Could that be any more vague? What counts as anti-social drinking of alcohol - failing to pass the Port to the left, perhaps? And we're not told of an outright prohibition, just that restrictions of some ilk exist. Not a very useful sign, then.