krex78,
the one i go to is at amk, near courts that side.
i think they are related to the following as i see their details on the card too:
1. gleneagles medical centre
2. thomson medical centre
3. mt alvernia medical centre
4. mt elizabeth medical centre
they closed on sundays and ph. half day on sat. if you walk in unless you are super early, if not need to wait for an hour or so. i heard from my friend, her daughter take her jab there. with appointment, the waiting can be as long as 1 hour too.
during the hot period of h1n1, they don't take in walk in. only by appointments only. they are also in full gear then which i think a bit 'kua zhang'.
so far, i only been there twice. usually, we go back to kk.