sorry for missing you out
BSS in HKU, HKALE median = BBbd bb, so it's not tough to enter the course.
BA in HKU, HKALE median = CCa bc. it's even easier than BSS.
NOTE: i suppose u mean normal BSS and BA courses but not tougher courses like BA(AS).
usually geography graduates either become a teacher in geography, or take a postgrad course and get a PhD. seldom ppl enter the business sector but those are rare.
i suppose u need to choose your major in geography in year 1/year 2?
not sure about other two uk unis but bristol is not bad.
suggestion: keep on in your hku application and see what's the results. hope u also get offers from HKU
PS very few hk ppl choose geography courses as 1st choice in uni application. most of us choose science, healthcare related, business or economics