That castle again

Two castle pictures. In the extra, the earlier picture; people abseiling off the wall ... 

A morning meeting in the Portrait Gallery cafe, then walked over to the conference centre by way of Princes Street gardens. Mild hazy sun; out without a waterproof jacket and didn't get rained on. 

Attended a session at the Quantum Technology day put on by the British Standards Institute on Quantum communication; about key distribution and what's actually been implemented, including by BT for communications across London. Found a couple of interesting people. 

Back across town in the afternoon; walked around by Pilrig Park later.