If you have Freesat there's a new gardening programme - new programmes every two weeks on Sunday mornings, repeated several time. Lots of focus on allotment growing. They bill themselves as Gardening programmes for gardeners by gardeners
If you don't have Freesat you can see the programmes on the website The Horticultural Channel | Gardening programmes for gardeners by gardeners.
This week was programmes 3 of the series which had a mix of proactical, features and an intruiging article about building a compost loo on an allotment site using a wheelie bin!