How Britain intended to contain an invasion beachhead

Would British resistance leave Napoleon dependent on sea supplies that the Royal Navy could cut off?

The preferred defence was to attack before the French established themselves, combining land forces with naval fire from the coast.

Martello towers would make the landing painful and slow the invaders while British forces assembled. The army, militia, and available artillery would then attack while the French remained close to their landing place. The Royal Navy could approach along the coast and fire into the invasion force from behind. The aim was to catch the troops between these attacks before they secured a firm foothold.