In Britain the weather is not going to be nice and hot all the time, and it’s not even going to be nice and hot continuously throughout the summer, and that means that it’s important to take advantage of any dry day, so no it’s not too early to light the BBQ.
The less wind the better when it comes to lighting a typical Barbeque, while a gas barbeque with a lid can be ideal all year round in your garden. Just remember to give your barbeque a thorough clean if it has been left alone all winter.
There’s not usually a problem with barbequing food on a cold day but you should make sure it’s warm enough to sit outside and eat your meal, and then you may begin to get an early taste of summer.