I’d exercise caution I have noticed UKV sometimes gets carried away, general models supporting 9-10C 850hPa temps further SE not exceptional. I can’t see 30C being a possibility with the air mass, typically minimum for 30C it needs to be 12C, I recall in summer 2018 this was enough at times, but there were drought conditions, soils were very dry and of course we were not as early in year. Not just locally but what makes is even more unlikely to our near south, France also has very saturated soils, which is not usual for the time of year. I’d say we probably will be limited to 27-28C which of course is still very warm.