I believe Rothschild bought the Quagga as a mounted specimen from somewhere?
Yes, Lord Walter Rothschild purchased the Tring Museum quagga, already mounted, from a taxidermist, named Frank, who was based in Amsterdam.
Although the original provenance of this specimen is not known for certain, it has been suggested that the Tring Museum quagga is probably one of the quaggas from the Knowsley Menagerie.
After Lord Stanely, Earl of Derby, died in 1851 some of the animals in the Knowsley Menagerie were sold at auction; a female quagga was purchased by Artis (Amsterdam) Zoo. When this quagga eventually died in Amsterdam, its skin was mounted for the Amsterdam Zoology Museum.
The last quagga ever died at Amsterdam Zoo on 12th August 1883; it too was stuffed for the Amsterdam Zoology Museum. It was decided that the museum did not need two stuffed quaggas, so the earlier specimen (i.e. the ex-Knowsley animal) was sold to the taxidermist Frank and the Amsterdam museum retained the specimen that died in 1883.
I don’t think that there is any definite proof that the mounted quagga that Rothschild purchased from Frank, was the same specimen that Frank acquired from the Amsterdam Zoology Museum (i.e. the ex-Knowsley animal) but it seems unlikely that Frank had two different specimens of the extinct quagga.
Despite it being so close I've never noticed anything from Whipsnade there- or London Zoo either but I expect some animals are.
I believe that the Komodo “dragon” at Tring is one of the London Zoo animals from the 1930s.