I have the same set mate, They're for bloody everything. Once you get into the guts of your car (or boat, or anything else) you'll find a bunch of fasteners that you previously would have wasted good quality swear words on trying to get purchase with ring spanners or trying to fit the ratchet handle and socket into the space and still be able to swing it.
They might seem redundant at first, but when you need one, they'll be worth every penny.
{They can be a bit frustrating if you're getting on the nut-end of a longer bolt, as they don't have a lot of depth and sometimes you won't clear the bolt, but I guess you can't have everything...[Well that's not true, you can get flex head ratchet spanners, but the Bahco flex head spanners predate the popularity of ratchet spanners by a bit, and I guess they don't see any compelling reason to change them yet (I love nested parentheses)]}