We looked this up on theRHS website, which advises 'Fresh conifer clippings can contain plants toxins and must be composted first for at least 6 weeks to avoid leaching of chemicals such as tannins out of the woody material which can harm plants'.
Gardening tips: Plant spacings
Get the best out of your plot by getting your spacings right - this encourages the growth of healthy, productive plants. Downloadthe guide(pdf file).
Nutrition: Grow your way to 5 a day
Find out about the contribution to your diet of various fruits and vegetables. Grow your way to 5 a day (pdf file).