Oh God! Must resist...I can't resist it. Here goes. If that's the lesser of two weevils, I'd hate to meet the other one. Aaah, that's better. I can't resist a weevil joke.
Especially as it's a shield bug. Not that I'm an entomologist or anything.
Interestingly, (or maybe not), if it is a bronze shield bug then it's the only carnivorous UK shield bug. When young, they live off plant sap like other shield bugs but when mature they have a taste for caterpillars and other insect larve including presumably weevil larvae. So maybe they should be encouraged. As
@rockyroller posted, they're also known as stink bugs as if you piss them off they exude a noxious fluid as a defence against predators. Perhaps
@Accy cyclist had a lucky escape.