We came across a couple of people poaching the Isla two sundays ago, fishing flying C's and had obviously been drinking. Every 20 minutes of so a can or bottle would float past us!
When in the middle of nowhere its very difficult to challenge someone, especially if they are drunk, in case it all goes wrong. We reported them using the 101 number, along with their car registration. Unfortunately we got a call back later in the evening saying they could not take it further as the car was unregistered, untaxed, had no mot and was uninsured and therefore they could not trace the "anglers".
It would have been handy if the issuing club (Strathmore) had a number on the permit.