Best Composters — 650L + Mid-range (2026)
1 composters matching capacity “650L” + price “Mid-range”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our Best Compost Bin UK (2026) guide.
#1 Pick
Forest Garden 650L Pressure Treated Wooden Slot Down Compost BinRated 4.3 out of 5 stars (210)
- Wood
- Large gardens
- 650L
£139.99
Pros
- Pressure-treated timber with a 15-year rot guarantee
- Slot-down side boards make it easy to access finished compost
- Large 650L capacity suits big gardens or allotments
Cons
- Flat-packed self-assembly required