According to Wikipedia –

The Marilyns were supplemented in 2007 by the HuMPs (Hundred Metre Prominence) which reduces the Prominence requirement to 100m. The list was compiled by Mark Jackson from a large number of sources and published online in 2010 in More Relative Hills of Britain. There are almost 3,000 British HuMPs, including three in the Channel Islands.

(c) Mud and Routes 2018

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