Reddit mentions of The Making of a Salafi Muslim Woman: Paths to Conversion

Most of her interactions seem to be with the Salafi women groups in the Brixton mosque along with a few other female Salafi groups, which disproportionately consists of Afro-Caribbean Christian and non-Salafi Somali converts to Salafism, along with South Asian, Middle Eastern, and white converts. Her ethnography only consisted of Salafi women, not men. It looks like this is one of the groups, and they have publications on why terrorism is against Salafism.

http://www.salafipublications.com/sps/

I haven't read her book yet, but I was able to look through the preview on Google Books and there are sections that briefly talk about groups like JIMAS (of which former leader, Abu Muntasir, advocated for his followers to fight in Bosnia, Kashmir, Chechnya, etc) and Hizb-ut-Tahrir, but the preview didn't cover all of those pages, so I don't know what exactly she wrote.

Apparently, she also talks about how, ironically, a lot of British Salafi groups in recent years have been involved in counter-extremism, handing out leaflets like the ones in Salafi Publications. British Salafi groups in recent years seem to be more quietist and are more into proselytizing to non-Salafi Muslims and advocating for a peaceful separation from non-Muslim society like Orthodox Jews or fundamentalist Christians, although there are apparently more "liberal" Salafi groups and competing factions of Salafis. But she mentions how, at least for Salafi women, there is a gap between the theory/ideology and the lived practice.

https://www.amazon.com/Making-Salafi-Muslim-Woman-Conversion/dp/0190611677