SATURNIA leaving Lisbon.

Thanks to Davidships and other friends to identify the ship and the port

Probably at Lisbon.
The tug is one of Lisbon Port Authority (AGPL)'s two-funnelled sisters CABO RASO or CABO SARDÃO (the slightly larger CABO ESPICHEL looked a little different)

IMO number 5314597 according Lloyds

Jimm,
It's very strange that these ships have visited Gourock on the Clyde.

PORT= ALMOST CERTAIN IT'S GOUROCK ON THE CLYDE

Correct correct the oldie SATURNIA
GP

SATURNIA for sure !
Saturnia has that post (vertical black pipe) behind the funnel while Vulcania has not.
brgds /jadran

Hardly an unknown here as the canted funnel top denotes this as the Saturna of these two near sisters, mrdot.