I think there is a confusion about companies with a Savile Row address. Take Steed for example, available at number 12 but HQed Cumbria - on the website it days Steed Savile Row and has details for both locations. On the website, there is information about bespoke and semi-spoke; however, Steed bespoke is never called Savile Row bespoke.
From a legal stand-point, there is nothing wrong wihh having Savile Row in the name because they are based there and with the information they are giving, at no point moment is Steed bespoke mentioned as if it is Savile Row bespoke.
To be honest, I would prefer people like Edwin (Steed) and William (William Westmancott) use locations on The Row then designers like Lanvin.
There is also another issue of cost and attracting the younger generation, a Gieves & Hawkes bespoke would cost at least £3.4k. In the summer they had a nice grey 2-piece suit on display in super 130's cloth and it was on sale for about £1.9k, I asked about the cost of bespoke and it would be £4k. Plus, some younger people may not want to walk into somewhere like G&H, Henry Poole, etc and likely find it easier talking to Edwin or William. If I really wanted bespoke for about £2k then I can go to Steed or WW and it is a good way of help The Row a tailors road, affordable and making it attractive for the younger generation.