Fishkeeping During A Heatwave

It has clouded over here too, so I'm taking the opportunity to do some water changes and using the water in the garden - the cucumbers are looking quite wrinkly at the moment. 

Presumably it is now baking sun where you are? We had the clouds here too and I was convinced it was going to rain at one point... not any more! Blue sky's and not a cloud in sight again... I might have to top up the pond soon... it's lost a good couple of inches already.

Cloudy, breezy, with a forecast top temperature of 20C.
Feeling of relief that I can spend a day functioning like a normal person around the house, rather than having all the curtains closed, windows open on the shaded side of the house, and hugging a freezer pack wrapped in a tea towel as if it was my favourite childhood teddy bear.
I can also spend some time in the garden without fear of heat stroke & sunburn, so I'm going to see which container plants can be rescued. I also plan to use tank water on plants during the day (rather than before 8am or after 9pm) without the worry of the water evaporating in under a nanosecond.
I think that you have a very valid point @Fishbeard we are not the worst offenders. We also have a responsibility to maintain our aquatic environments. I think that as long as we are mindful about our water usage, avoid peak periods where possible, limit the amount of water we waste, and reuse waste water where possible, then I think we're probably doing the best we can under the circumstances.