This was a randomized, double blind,fixed dose, placebo controlled, parallel-group pilot study to obtain data on size and variance of treatment effects in subjects with mild to moderate Psoriasis. The target sample size of 60 was selected as a practical figure for recruitment purposes in one centre over 3 months.After a 2 week washout during which only emollients were applied to their psoriasis, patients attended for baseline assessment of psoriasis severity and blood tests.Subjects attended every 4 weeks for 12 weeks for clinical assessment and blood tests.Each patient once eligible{see inclusion & exclusion criteria} was allocated to either active treatment or placebo in identical packing for a total of 12 weeks.