NORTHERN ROCK arriving in Hartlepool.

IMO: 9728887
MMSI: 244850087
Call Sign: PCZQ
Flag: Netherlands (NL)
AIS Vessel Type: Cargo
Gross Tonnage: 2989
Deadweight: 3285 t
Length Overall x Breadth Extreme: 92.2m × 14m
Year Built: 2015

Vessel data courtesy of Marine Traffic.

See also: http://www.northeastmaritime.co.uk/viewtopic.php?f=43&t=20513&p=44798&hilit=NORTHERN+ROCK#p44798

NORTHERN ROCK loading at Irvine's Quay.

..and this: http://www.northeastmaritime.co.uk/viewtopic.php?f=11&t=18839&p=41056&hilit=NORTHERN+ROCK#p41056

NORTHERN ROCK (9728887), Netherlands, 2989gt, completed Police 9-2015

Hartlepool - 30 June 2021: Ron M

As to the flag....no comment.