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The crucial sentence in your news item was: "The 322 participants were not deficient..." Indeed, participants of this New Zealand trial (1) had a mean baseline 25-OHD level of 72 nmol/l. In contrast, people living in Scotland have a mean level of 36 nmol/l. (2) A trial conducted in Scotland to replenish the vitamin D-deficient population would most likely show a number of health improvements, including preventing common colds.
1. Murdoch DR et al. Effect of Vitamin D3 Supplementation on Upper Respiratory Tract Infections in Healthy Adults. The VIDARIS Randomized Controlled Trial. JAMA. 2012;308(13):1333-9
2. Zgaga et al. Diet, environmental factors and lifestyle underlie the high prevalence of vitamin D deficiency in healthy adults in Scotland and supplementation reduces the proportion that are severely deficient.J Nutr. 2011 Jun 22.