Recent terrorist incidents in the UK:

7/7 bombings - 3 of the 4 attackers were British born and lived in Leeds, the fourth was a Jamaican immigrant. All were British citizens

2007 letter bombs - Miles Cooper was from Cambridge

2013 anti Islam campaign - he was Ukranian, and in the country legally

Lee Rigby killing - one attacker was born in Lambeth to a Christian family, the other was anglo-Nigerian (probably a dial national)

2014 parcel bombs - an offshoot of the IRA, perpetrators unidentified

Murder of Jo Cox - he was from Scotland

2017 Westminster attack - attacker was a convert to Islam born and raised in Kent.

Manchester Arena bombing - attacker was born in Manchester, though his father had indeed been a refugee. He wasn't.

London Bridge attack - one attacker was British and grew up in Britain, one was Italian, and Redouane is about the only person in this list who fits your profile, he was a failed asylum seeker.

Finsbury Park attack - he was from Cardiff


Very, very few of these perpetrators, probably only Redouane, are refugees or asylum seekers of any kind. The vast majority are home grown.