Stan,
Some years back Ron Henderson from Tyneside sent me this view of the Tees firefloat, with a nice selection of shipping at Tyne-Tees/Dent's Wharves.
I showed it on my TEESSHIPS website and Neil Mearns subsequently provided the following information:
She was one of a class of 15 or 16 "Estuarial Fire Boats" constructed for the National Fire Service in England and Wales during 1943/44 to supplement a wide variety of non-standard craft already in existence (I believe three additional similar craft were stationed on the River Clyde). Although most of the craft were named, it appears that this vessel was not, but was known by her N.F.S. designation "Estuarial Fire Boat No. 35" and her alternative N.F.S. Serial Number "Fire Boat 476."
"Estuarial Fire Boat No. 35" and her sisters were 52 feet in length, propelled by twin 100 h.p. Chrysler engines and equipped with four heavy firefighting pumps capable of delivering 2,800 gallons of water per minute. I have not yet discovered who built her. She entered commission on 18th July, 1943, being allocated to the N.F.S. No. 2 Fire Force Area and was stationed at Middlesbrough. She remained in service after the war, being transferred to Middlesbrough County Borough Fire Brigade on 1st April, 1948 when the provision of fire services was returned to local authority control on a nationwide basis. She was disposed of some years later, being replaced by more modern craft.
Ron