Belgium here, neighbor of the UK. Summers do get hot here and more and more people are installing bidirectional heatpump units (cool and heat). Also... dishwasher, washing machines are heavy electricity consumers.
Decades ago, it was the cheapest to run these at night, when there was little power consumption. These days you run them around noon, when production is at maximum. With the right energy contract, you actually can get payed to consume electricity during these times, although it does not happen that often.
Met a guy who made this his hobby. He installed solar panels, added some beefed up batteries to his home grid. He actually charged his batteries during this period and sold the electricity back when demand was higher in the evening. He even helped balancing the grid to 50Hz and got payed for that. He made profit with his installation. He did not get rich, but it did pay back all his investments. If enough people do this, GWh capacity is easily achievable... Interesting times we live in.