Thank you for your suggestion HubertG but I don't think it could be anything from 'Prima Ballerina' as a parent - except that 'Compassion' is quite close to my plant in its uniformity of flowers and has remarkable scent.
Another of PB's offspring, the larger 'Fragrant Cloud' has heavyweight, almost cabbage-like dark coral heads. My mystery plant had narrower, boxy, high-centred blooms, turbinated with a spiralling lantern shape, never flattening out, did not show the middle or change it's orange-tinted deep pink colour before the petals began to drop.
I grew Prima Ballerina this year and was seriously disappointed by the individual flower, the shortness of the plant and even the scent, having allowed myself to believe it would be something spectacular.
According to the 'Rosebook', Paris Charm has clusters of 5-7 blooms as well as solitary ones - my mystery plant had 1s or up to 3 together, each flower on a vertical, 5-7 inch, light-green fuzzy peduncle. The main growth of the plant was prickly and painful to grasp without gloves.
Can 'Paris Charm' easily grow to 5-foot tall here in the UK?
People might think 'Yawn - there's no pleasing some' but though the mystery plant definitely looked like a familiar coral hybrid tea it was at least comparable in form and colour to something like 'Touch of Class' (but not with ToC's 6-inch blooms!) and way better than most in the fragrance department - my clear favourite there.