Page 8 of CAA Safety Sense Leaflet 7 contains reasonable approximations. For some reason FAA has never worried much about any performance figures not in the POH, whilst the UK's CAA has always taken it a lot more seriously. Perhaps due to the much shorter runways we tend to operate from in the UK.
https://publicapps.caa.co.uk/docs/33/20130121SSL07.pdf
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