There's no city there. That point is in a cultivated field in a large farming region of eastern England. It's just east of the A52 highway (Sibsey Road), south of Boston Long Hedges, and west of Willoughby Hills Road. The nearest towns ... all within about 4 miles ... are Frithville, Fishtoft Drove, Anton's Gowt, Frith Bank, (I am not making this up), Frampton Fen, and Wyberton Fen.
If you were shooting for London, you missed it by about 100 miles.