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I have identified a second one of these in my collection. This one was take in Whiteknights Park, Reading on 2019-08-18 (exactly one year later). It also keys to Delia criniventris and the cerci each have a backward-pointing 'tooth' in exactly the same place as the first one.

After seeing my pictures of the 2018 specimen, Phil Brighton suggested the teeth might be stuck-together hairs. At the time I wasn't convinced but in the 2019 specimen the teeth show very clear striations consistent with them containing hairs and I am now inclined to accept that explanation.