Band-bellied Crake! It was still there later this afternoon and was seen by a number of birders (including me - a Planet Earth tick!). With the three previous records comprising two dead birds and a bird taken to KFBG this is real mega!
It was a matter of time before one turned up and was twitchable - thank goodness it was on HK Island not an off shore island!
The key features are the orangey legs,and the barring on the wing. The bill also looks very stout cf. other similar crakes.
Thanks Philip for taking us to the exact spot!