We have thought about other options including cementing the pond which will stop Billy eating through the lining, however, this is expensive, and not something I have the money for right now. So, a new pond liner was needed. A Spanish guy did suggest cutting his beak off, however, this I felt was a bit extreme, and maybe a step too far.
Flippantly my husband said "why don't you dig the pond deeper since the liner is out" and in a split second of madness I considered this to be a fantastic idea, and rushed off to get shovels.
What should have been a 30 minute job, I managed to transform into a 3 hour job, but it was a good job done, as the ducks can now freely swim around the pond. Billy was first to jump in and spent the rest of the day ensuring that the water would not remain looking so clean for very long!