E284 is dated 1873–1902 and E222 to 1902–35. The later flag resembles Eastern Telegraph’s with an additional blue E above ETC. It is generally ascribed to Eastern Extension Telegraph, apart from the Brown 1943 index.
The company was formed in 1873 from British India Extension, China Submarine Telegraph and British Australian Telegraph. Another account places its combination with Eastern & Associated in 1872, preceding that formation date; Rosanoski explicitly questions the sequence.
U.K., London.
Keep the explicit scope label independent; no alias or company identity is inferred.