Right or wrong, there are two things I'd do in your situation. 1) I'd ensure I'd got a healthy worm population in the deeper part of the bin and, 2) a couple of bricks on the top would help compact the newer, looser contributions to create more capacity, more quickly.
Thanks again everybody. After a couple of weeks the level went down enough to fill it back up. A bit of a sludgy mess at the bottom of the compost bags but nothing unexpected.
Will have to try and find a dumpy bag to use as a backup compost bin. Or find some space for another dalek...
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Will have to try and find a dumpy bag to use as a backup compost bin. Or find some space for another dalek...