Devon,
United Kingdom 
when and how to prune olive trees
5 Oct, 2010
Devon,
United Kingdom
when and how to prune olive trees
5 Oct, 2010
In spring just before growth starts. You only need to prune it to keep it in shape (maybe it's a trained shape already) or to keep it within bounds, or to make it more bushy. They won't produce useable fruit in the UK so you won't be pruning for increased fruit production.
6 Oct, 2010