I was asked the other day about Turners Hill which at 271 metres (889 ft) is the highest hill in the West Midlands wasn’t a SOTA summit. I did explain that hills need a topographic prominence of 150 metres, which Turners Hill exceeds being P161 according to Peak Advisor. Is there anything else that has to be taken into consideration?
I would take into account the likely inaccuracy of Peak Advisor.
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I would also suggest a visit to Specsavers as the listed prominence is 91m 
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This was the first time I’d head mention of ProportionalProminence. I’ll need to read the definition a few times to see what the author is on about.
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My mistake, at first it didn’t come up but was showing in the Google search listings as 161 m, curious enough the Saturday Walkers Club lists it at 87m so does The Mountain Guide. I can’t replicate that search
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Take your own medicine, The Mountain Guide and Saturday Walkers Club websites say 87 m even lower
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IIRC there is a large quarry on the summit, it looks like the quarry is for basalt or dolerite, and this has likely led to historical changes of prominence.
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