Below is an incompletelist of diplomats from the United Kingdom to Prussia, specifically Heads of Missions sent to the Elector of Brandenburg and to the Kingdom of Prussia from its formation of in 1701. From 1868, the ambassadors were attributed to the North German Confederation.
1751–1756: Apparently no representation [1]
Loftus becomes ambassador to Prussia's successor state, the North German Confederation
George Pitt, 1st Baron Rivers was an English diplomat, politician, military officer and peer who served as the British ambassador to Spain from 1770 to 1771.
Fulke Greville (1717–1806) of Wilbury House, Newton Toney, Wiltshire, England, was an English landowner and diplomat.