So this year I bought some cheap deep (300mm + ) storage boxes from Q&B and then created a sort of raised bed that could be covered with a debris netting hooped frame. Storage boxes had draining holes made (melted rather than drilled) and then filled with a mix of general purpose compost, sharp sand and a bit of FBB. Carrot seed Marion were sown successionally and what great results so far. Started harvesting in July and I recon will still be harvesting in early 2024 unless we get a severe spell of frost.