As Monsieur Smartie says - you'll get many opinions based on 'fact' - the right oil for your engine isn't going to be the right oil for someone else's engine, because they're not quite the same.
You can either have a word with a tuner and ask their opinion, or, go to
www.opieoils.co.uk (the Opie chap's also a member here) and ask their advice.