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Rennie was on the verge of starting a new role as Sheffield Hallam University chancellor when he was admitted to Northern General Hospital in October.

JSO's most high-profile figure, Roger Hallam, is one of the five activists convicted for their role in the M25 protests.

The failure lay with the UK's "elites and our leaders" who had walked away from their responsibility to tackle the climate crisis, Hallam claimed.

Hallam was originally jailed for five years for agreeing to disrupt traffic by having protesters climb onto gantries over the M25 for four successive days.

Roger Hallam and 15 other protesters were jailed last year for their roles in four demonstrations held by JSO, including climbing on gantries over the M25 and throwing soup over Vincent van Gogh's Sunflowers painting.