I can tell you one thing, I certainly worked hard for these 4!!! That last one came off a margin spot that I had been baiting for the 4 days; 3, 4 sometimes 5 times a day, around the other side of the lake to where I was fishing. They didn't get on it properly until the last afternoon. I had it less than 30 seconds after placing the rig in!
The fish had been following the spawning bream around getting pre occupied on eating the spawn. It took a hell of a lot of bait, discipline and patience to get any pick ups.