La Roche-Posay, Garnier and Ultra Violette all come to mind, but when it comes to the facial SPF category in both Boots and Superdrug, there's a clear winner: Bondi Sands Sunscreen Lotion SPF 50 ...
Whenever the UV Index is 3 or above, the Cancer Council recommends applying at least one teaspoon of SPF 50 sunscreen to the face (including neck and ears), and reapplying it every two hours.