Someone must have heard my prayers.
Waitrose now stocks Sharpham Park’s Organic Spelt Flour, stoneground and refined.
Given that I use only 30% spelt (the rest is 5% buckwheat, and the remainder from wheat), I can even swallow the exorbitant price. Only just, so the search for a reasonably priced refined spelt flour continues. At least I’ve got an interim solution now.