Thanks for your thoughts guys, much appreciated. I had a feeling he was wrong but didn't like to question him too much, but now I now a little more with regard to needing a licence to move fish I will speak to him next time I go. As far as I know the lake in question isn't part of any club, it's a small family run private water I believe, not very busy but quiet and tranquil.
ColinW, don't worry, I didn't antagonise the chap. He came round later in the day and asked if I had caught any, my answer was of course No, the last thing I want to to is upset anyone.
Neil G, I love the river, it's my favourite place to fish without a doubt. The reason I'm fishing a lake is because it's so close to my partners house and she brings me lunch
I tend to save the rivers for weekdays and fish the odd lake on a weekend.
once again, thanks for your thoughts.