‘Can I have a grenade please’

A would-be bomber was arrested by armed police after trying to buy a grenade from an undercover detective in Costa Coffee, the Old Bailey heard. Mohammed Chowdhury, 24, spoke to the operative known as ‘Gary’ over the social media application Signal in January this year. Jurors were told Chowdhury asked for three grenades for £300 each. He travelled to Costa Coffee on Wanstead High Street, east London, to seal the deal on 5 February, it was said. But Chowdhury did…