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Girling had many generations in boatbuilding from the early 1800s till 1900s. There was certainly a Girling using the boatyard site of my ancestor in the early 1900s, strangely this was after it was sold to Harts. Early Girling yards were at Carrow first on the Abbey side, later on the opposite bank. As the banks became industrialised at Carrow no doudt the young generation of Girlings moved east down river to Thorpe.
George Thetford's yard was at 10/11 Bungalow Lane. The Yare Valley Sailing Club was formed there in 1948. George was still there in 1961 but I don't know when he gave it up or sold it. Today the land is private but little changed from its boatyard days. On the attached map the yard is shown edged red. The BA dockyard abuts the right hand edge of the map. I hope this helps your researches.