About 100 miles.
172.84 kilometres (107.4 miles)
107.4 miles (172.84 kilometres)Source: True Knowledge
Lincolnshire is a big place (for the UK). From Spalding in the South it is about 100 miles to London. From Grimsby in the North it is about 190 miles and from Lincoln itself it is about 140 miles.
hmm the answer should be ... how should i know! i have not one idea