Your article on Qinetiq's Sentry surveillance craft (The Big Picture, 1 October) was interesting.
Amusingly the photograph accompanying it (perhaps because it was a sea trial) shows this vessel of 'speed and agility' displaying the internationally recognised shapes for 'a vessel restricted in its ability to manoeuvre'.
Martin Figg
Weymouth
Invinity to build 20MWh flow battery in UK
A surprising comment for someone who (I think you´ve said in the past) worked in the industry. National Grid have a variety of reserve service schemes...