Rampant low Vitamin D
Here in Australia there are more cases of vitamin D shortage than in England. Given the double amount of sun hours per annum here in Down Under, that's quite counter intuitive. In fact, an estimated 31% of adults in Australia have inadequate vitamin D status, increasing to more than 50% in women during winter–spring and in people residing in southern states (Nowsen et al., 2012). 

It turns out that in Australia people are, rightfully, careful of sun exposure due to the thin ozone layer and the resulting high incidence of skin cancer. As a result, people here wear long-sleeves on the beach, use high-factor sunscreens, wear sun hats, use umbrellas to evade the sun etcetera. The Australian  Cancer Council supports the famous "slip, slop, slap" slogan: 


  Slip on a shirt, slop on sunscreen and slap on a hat, Slip, Slop, Slap! You can stop skin cancer [..]!


Hence, folks here in fact often take vitamin D supplements, despite the large amounts of sun hours.     

Reference
- Nowsen et al., MJA (2012); 196(11): 686-7