Can anyone tell me where the Thames Conservatory was/is?

Answer 1

This is what I have found on the internet.

The Thames Conservancy Act 1857 established a Board of Conservancy to control the tidal part of the River Thames. Amongst other duties, the Board was given responsibility for dockings. A few years later, it was reconstituted as the Thames Conservancy Board (1). This was presumably in 1861, when the authority of the board (commonly known as the Thames Conservatory) was extended from just being for the Thames below Staines, to the whole river (2). Another source gives the extension of powers to the Upper Thames, as taking place in 1866 (3). One of its first orders, affecting the upper river, was the cessation of all discharge of sewage into the river by 1868 (4).

A subsequent act, the Thames Conservancy Act 1885, was passed "for the preservation of the River Thames above Teddington Lock for purposes of public recreation, and for regulating the pleasure traffic thereon". It covered the River Thames between Cricklade, Wiltshire and Teddington Lock, and included "such backwaters, creeks, sidechannels, bays and inlets connected therewith, as form parts of the said river, within the limits aforesaid" (5).

The Thames Conservancy Board shed its responsibility for docks in the tidal Thames in 1908. This was transferred to the Port of London Authority by the Port of London Act 1908 (1).

Answer 2

Possibly along the Thames River in London. Call the British Embassy in New York or Washington DC.