What was the error in 1790, if any, of the lat. and long. of Greenwich Observatory of 1783?

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I found the answer. In 1790, no error was found.

Roy [who headed the survery] probably did not know that in 1785 Maskelyne [who was confident of the coordinates of Greenwich] had equipped his assistant Joseph Lindley with a number of watches and sent him on a secret "chronometer run" to Paris, to determine the time difference between the capitals. Lindley's result (9 minutes 20 seconds) verified Maskelyne's astronomically deduced value, published in 1787, which was later found to agree with the result of Roy's triangulation.[31] Roy avoided admitting this embarrassing consistency [...] [emphasis mine]

Source: Widmalm, Sven. "6. Accuracy, Rhetoric, and Technology: The Paris-Greenwich Triangulation, 1784-88." The quantifying spirit in the eighteenth century. University of California Press, 2020. 179-206. p. 188

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What was the error in 1790, if any, of the lat. and long. of Greenwich Observatory of 1783?

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