By Bradley Jolly Today was officially the hottest day of the year as temperatures exceeded 21C in two places, the Met Office has tonight told the Mirror. A glorious 21.5C was recorded in both St James Park in central London and Northolt in the west of the capital today. The mercury also exceeded 20C on Thursday in Norfolk and is likely to do so tomorrow, the Met Office said. But the 21.5C figure – way above the average for April – smashes the previous record for the hottest day of 2024, which was set last Saturday. The mercury was hit 20.9C then, again in the capital. This is a breaking news s…