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Could it be a white meadow cranesbill? Definitely not a mallow as they have stamens fused into a tube.
... in the "expert" quiz level, so I've come to check out all the Sidalcea hendersonii observations, as they are usually artefacts of the taxonomic database. I added a tentative ID before noticing that you had commented.
Lat/Lng: 55.253, -1.568
OS grid ref: NZ275955