Can you become secondary teacher with a BA in criminology and sociology?

Yes, but you might need to do an additional subject knowledge course because there's not usually much space in a curriculum for a full-time sociology teacher, so you'd usually be expected to teach something else, too.

I'm currently doing a joint honors in criminology and sociology I did also enjoy doing law at Alevels so maybe? Do you have to do an additional course to teach or is a BA enough?

A degree is enough, then you need to get QTS, lots do that via the PGCE route.

Thanks that was really helpful, and is a QTS preferred? or is it equivalent
to a PGCE?

QTS allows you to teach in state-maintained schools and the PGCE is a separate, internationally-recognised qualification. You can get QTS without the PGCE but it is worthwhile having the PGCE too (and QTS is bundled in as part of PGCE training).