The opening of the Chelsea Flower Show next week marks the start of the social season with a visit from the King and society figures who want to “be seen”.

This year, visitors to the show in southwest London will also include Briony, 29, a serving prisoner who is being let out on a temporary licence to work on an exhibit she helped to design.

She and some recently released prisoners from HMP East Sutton Park in Kent have put together a display of indoor plants for the Glasshouse Effect, a project that aims to help female prisoners re-enter society.

The display includes “second chance plants” grown in empty food tins alongside prison-issue jackets and boots.

Briony, who has a year left of a five-and-a-half-year