Following the success of the St Helier trial, the 1st mainland British post box was erected in Botchergate, Carlisle, in 1853.
The oldest surviving post box still active is located in Holwell, Dorset. Installed in 1853, it is octagonal & has vertical a slot rather than the horizontal we see today.
www.bbc.co.uk
Nestled in the village of Holwell, Dorset, is one of the first octagonal-shaped postboxes.
