The Tyne tug IMPETUS on the River Tyne between Newcastle and Wallsend.
IMPETUS (5159703): Ridley Tugs Ltd., Newcastle, 141gt, completed Cuxhaven 7-1954.
1969 JOACHIM (West German), 1984 STORESUND (Denmark) - 1997 MADERA V (Italy, but Panama flag)
Still in service, 58 years old, according to Equasis. (A nice Albert Weller view for which, unfortunately, the negative does not seem to have survived!)
See also: http://www.tynetugs.co.uk/impetus1954.html
Ron