Just in case anyone who replied is interested. Rather than spend money I decided to go back to the Planet X Fizik faux arione just to compare with the WTB. Set it to same angle as the WTB and positioned at the same centre line front to back (the P-X is quite a bit longer).
Result – I’m very pleasantly surprised. Massive improvement in comfort over the WTB. Not very comfy but close to acceptable. I’ll keep going with it for a while.
My only line of thought now is, would a real Fizik Arione be more comfortable? You’d hope that at £70/£80 for the cheapest that it would be better than an imitation but who knows. Anyway for now and the miles I’m riding at present I’ll be sticking with this.