The lost villages of the Yorkshire coast, showing scale of erosion & loss since the Roman era: http://www.eastriding.gov.uk/coastalexplorer/pdf/1development.pdf

From the same source, a suggested eventual stable coastline for Yorkshire, to be reached in 1000 yrs or so:

May be too expensive/impossible to protect Withernsea &c; if so, Lincs/Yorks becomes 1 big bay http://www.hull.ac.uk/coastalobs/eastgarton/erosionandflooding/index.html

Lincolnshire saw less loss, poss as protected by offshore islands until c.13thC; lost villages after this tho', incl Mablethorpe St Peter, >

> Old Trusthorpe, Old Sutton on Sea, Mumby Chapel+Old Skegness. Ruins of Mablethorpe church could be see until 1870s from the modern shore!

Of course, Lincolnshire has seen some v signif coastal changes too--map w/ situation c.500AD: http://www.caitlingreen.org/2014/10/post-roman-provinces-landscape.html#fn3

Note especially the offshore islands, suggested to have been finally destroyed by the sea in the 13thC, see refs on page :)