Looks like 4 older trawlers being broken up in the same dock. One of them has the registration number on the funnel and it ends in "9"

Photographer unknown

The first vessel that Booth's broke up was HMS Corunna which arrived on the 11th September 1975.
Following that they bought Nine Trawlers.
D.B. FINN (H332): ST BRITWIN (H124): NORTHERN PRINCE (GY121): N SEA (GY142): N SUN (GY440): N CHIEF (GY128): N ISLES (GY149): CLOVELLA (A63) and BRACONHILL (A138)

The only one with a '9' is NORTHERN ISLES. The funnels colours are British United Trawlers, so I'm guessing that this is Four of the Five Northern's, but which one is which is another matter..........

NORTHERNs CHIEF, SEA and ISLES appear to be sisters from Cochrane in 1950, so the one on the right could be CHIEF or SEA.

Maybe.