The Department has no plans at present to commission such research. SunSmart, the national skin cancer prevention and sun protection campaign, run by Cancer Research United Kingdom on behalf of the UK Health Departments recommends:
spend time in the shade between 11 and 3;
make sure you never burn;
aim to cover up with a hat, t-shirt and sunglasses;
remember to take extra care with children; and
then use factor 15+ sunscreen or higher.