The swift was clearly not a standard Apus apus
Indeed the bird was pale sandy coloured, scaly appearance on the belly.
noticeable pale throat & translucent inner primaries.
Other observers noted blunted (rounded) wing tips & the flight being
more that of a swallow then a swift when feeding.
The fork in the tail was also only a small notch.
The bird also appeared larger headed and fatter bellied & a bigger bird
then common swift (though this may be due to colour)
For all intense and purposes the bird appeared as per the many pallid swifts
I have seen abroad.
However I have no knowledge on the race A. a. pekinensis!