Grosmont, North Yorkshire
The only one beginning with Gros in my Atlas of Britian is Grosmont, North Yorkshire.
In the UK, towns that end with "Gros" include Grosmont, which is located in North Yorkshire. As for towns ending in "Bea," there are few notable examples, including Beauly in Scotland. Towns that end with "Mont" include Montrose in Scotland.
There are no such towns.
EghamOldham
Burger king.
morecombe
Derby, Tenby, Whitby
Fowey in Cornwall.
Grimsby, Corby, Whitby and others.
Dartford, Bideford, Chelmsford.
Never heard of that one. Plenty end in '-be', because that is '-combe'.
Bournemouth, Dartmouth & Portsmouth are three examples.