UPDATE...

So, since the last entry on the blog...
I recorded a singleton bird at Millquarter Bay, in the Strangford Lough Narrows on
02 September, calling away.
First re-sighting of a ringed bird came in, with a great photo, from..... DORSET!! Chris Patrick observed CLBY at the RSPB Reserve at Lodmoor, Weymouth Bay on 03 September, a bird which was ringed at Dublin in March 2015. Chris thinks the four birds he recorded are the earliest Dorset records by some two weeks.
John Moore recorded "several hundred" geese from Island Hill, Strangford Lough, yesterday, and Frank Eliffe and his wife, Myra, recorded two geese from Laytown Beach, Co. Meath, yesterday, too. He tells me that they keep a note of their first goose record each winter for this location, and this was the earliest.
Kerry Mackie reported this morning that there were now at least1,000 geese at the north end of Strangford Lough, so late this afternoon I have attempted to do a count (not up to Kerry, Hugh Thurgate & Alex Portig's exacting standards, I'm afraid!), and came up with the following:
Greyabbey: 10
North Strangford Lough (out in the middle!): 1,030
Castle Espie South: 128
Castle Espie North: 18
Island Hill North: 200
So, acknowledging that my counting is very far from an exact science, it appears there are now at least 1,400 brent located at the north end of Strangford Lough.
Light wasn't great, but two more sightings added.