When i was in school the other day (in London, England) a big flying insect flew at me and then kind of hovered next to me for a while. It was bright yellow on its head and end but the middle of it was like a black/brown colour. It must have been about 5cm long maybe more and about 3cm wide. The insect looked liked a bit of flying yellow and black chalk. Even though it was big i couldn't see its wings or legs. I have never in my life seen this creature before. I thought it might have been a foreign wasp at first but i'm not sure anymore.
Please could you tell me what it is ???
Cassie X x x