Shorelarks 4th January 2016. How many?

[pshakeshaft]

Timing of the twitter posts on 4th January 2016 suggests there are two sets of shorelarks around the cemetery, or else there is exceptional disturbance.

By AC @ 8.54am, north of cemetery.
By CD @ 9.18am south.
by SE @ 9-24 am south.
by DC @ 9.57 am north.
No post but seen by me at 10.30 am north
by JR @ 12.03 am south.

Does anybody know for certain?