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Just got permission from the farmer while i was looking round the lake, 80 euros for a year! he said no body has ever asked him before I am buzzing

Water depth and oxygen levels in relation to stress will be an issue in shallow lakes. The mostly deeper lakes on the main continent are not as likely to cause as much stress. Oxygen is not as big an issue in the depths of lakes as it is in shallow waters. Fish can fight themselves almost to death in warm water, and take ages to recover. In theory, yes. Yet every year adults as well as children die in lakes and rivers. A no swimming lake just outside Norwich, a number of deaths related to swimming in hot weather.

Action stations at home. The last few days 2 of the koi have started sitting high up in the water in the flow of the filter return. No probs I thought, it's just because they like the flow of the water over their gills. Then a couple of days ago those 2 fish stopped eating. I've checked pH, nitrites, ammonia, phosphates..... all fine. Then last night a few of the others started sitting in the flow of the return. They're still eating ok but I'm obviously getting worried. I already have two air pumps feeding several air supply systems but they're all in the filter. This means the freshly oxygenated water is all coming out of that filter return and it's looking like the koi are desperate for it. None of the fish are gasping at the surface but they're opening/closing their mouths quicker than they normally do. Not yet gulping, but it looks like it could be on the way. Obviously the heatwave has elevated water temps considerably so it's becoming clear I need more oxygen as soon as possible. I'm picking up a new air pump later with a new air stone... both the biggest I can get. On paper there's loads of oxygen going in already but it's a big old pond with big old fish. Hopefully the new air line will sort it.