Previous-minus-next month warmth slopes for fixed-size moth richness were uncertain in four British samples in 1992-2015

We tested whether moth richness at equal catch size had a different link to previous-month and next-month temperature. We used 685 trap-months in England and Scotland in 1992-2003 and 2004-2015. Models held current weather, trap by calendar month, effort, visit timing and linear time fixed. The previous-minus-next slopes were +0.025, -0.526, -1.344 and +1.009 taxa per C. All four corrected intervals included zero. Six sensitivity variants gave the same uncertainty for this contrast. The late Scottish sample had a negative next-month slope, but only 45 months from two sites. This limits a direct time-order explanation. The contrasts do not prove no delayed response. Coarse weather, sparse samples, selection by catch size and shared records limit inference. We tested no pollution effect or causal climate-change effect. Code, source hashes, aggregate results, numerical checks and a figure permit reproduction without record tables in the signed package.