I think the summit is better tagged as man_made=survey_point + historic=memorial + memorial=plaque. The actual war memorial is the area donated to the National Trust, which might be quite hard to identify if not in the NT open data. Compare with the WWI memorials to men of Cumberland (Scafell Pike tops) and the members of the Fell & Rock (memorial plaque outlining area on summit of Great Gable). The latter is very we.l documented by the FRCC themselves. Werneth Low Country Park in Hyde is, I believe, similar, but in that case there is a large obelisk acting as a monument on its own.