This refers to the boundaries of the UK parliamentary constituencies: the boundaries are due to be re-drawn, and the proposals are now out for consultation. They can be seen here (and once you are on that page you can use the buttons at the top left to view the existing and/or new proposed boundaries).
Any member of the public can submit feedback to the boundary commission, but hurry, the current round of consultation closes on 5th December. Brightling would be in a proposed constituency to be called simply “High Weald”. This new constituency would be if anything even more exclusively rural than the present Bexhill and Battle constituency, the largest towns in “High Weald” being Crowborough and Tenterden.
The Parish Council considered commenting on the proposals but, having no objection, decided not to.