Facial Moisturiser with SPF 15+

Hi, I'm a longterm (10+ years) psoriasis sufferer, and have psoriasis all over the body including my face. I have tried countless of products, normal moisturisers, prescription steriods (avoid!). Somehow I mangaged to control psoriasis on my face compared to how it was before, however during every winter time the psoriasis gets really bad and unmanageable. I've tried countless of products for my face, i.e Aveeno, Cetraphil, CereVe, Doublebase, E45 just to name a few, but looking for something with SPF 30 alongside. So far been using Simple Protect 'N' Glow Triple Protect Moisturiser SPF 30+ when on offer, but the amount you get for the price gets rather expensive over time as the small bottle doesn't last. Has anyone found any good alternatives with SPF 15/30+ that doesn't burn or irritate your skin? Thanks