Chasers approaching the Menai suspension bridge, which spans the channel between the island of Anglesey and Wales. Aled Jones notes that the chasers are traveling north up the Menai Straits from Caernarvon Bay.
View from a chaser under the bridge:
Photographs of Menai suspension bridge. T. Woofenden Collection - Photographs from the service of Unit 21 (SC 178, SC 254 and SC 329).