Forecasters said Norfolk could be expected to see temperatures up to 18C.
Parts of the UK are expected to be hotter than Barcelona and the Costa del Sol on Thursday, with temperatures reaching up to 18°C, while Spain's highs are 14°C and 12°C. Other European areas like Malaga and Lisbon will be cooler. Although it's the UK's hottest day so far, not all regions will be hotter, and cooler weather, including possible snow, is expected next week.
