Late medieval walls and the foundations of what appears to be a military spur, which formed part of the outer defences at Edinburgh Castle, have been found.

The defences, which date from at least the 16th Century, were discovered by archaeologists during foundation works for new Military Tattoo stands.

Service trenches were opened which revealed two structures about 2m beneath the esplanade.

Archaeologists will record the remains before they are reburied.