From the BBC site:
Campaigners against proposals for a new parliamentary constituency which would incorporate parts of Devon and Cornwall are staging a two-day protest.
Government plans suggest constituencies with 75,000 voters, which would incorporate part of both counties
Cornwall’s six MPs have criticised any moves to combine the constituencies.
Protestors are following the River Tamar from Marsland Point in Devon to Saltash in Cornwall where they are due to stage a rally on Sunday.
Plans to re-draw the boundaries are being discussed at Westminster on Tuesday.
It is predicted that if boundaries are changed, South East Cornwall or North Cornwall would merge with Devon West and Torridge or Plymouth Moor View, incorporating two sides of the River Tamar.