These are the Casualty Clearing Stations I've been able to find references to.
- War Memorial Hospital had one attached
- St Paul's Hospital Causeway Bay
- According to this source there was the hospital itself, an auxiliary - presumably Relief - hospital, and a CCS - https://gwulo.com/node/36575
- Yeung Wo Hospital
- Old Kowloon Military Hospital
- St. Stephen's College, Stanley - then scene of the worst atrocity of the hostilities on December 25-26, 1941. It had been opened three days before, so probably on December 22: https://digital.lib.hkbu.edu.hk/1941hkbattle-qef/en/data.php?show=item&…