The information on oil viscosity and specification should be in the owners manual - you may need to select the climate temperate range for the UK as the tables printed are often multi-market.
Don't worry about the semi-synth, etc - viscosity and ACEA grade are the important bits.
If you haven't got the owners manual or it doesn't give it then contact Mitsubishi directly - some dealers are slow to change bulk supply oil specifications and can't be relied on to use/recommend the correct grade - the majority are fine but since you never know who the dumb ones are, check with the manufacturer or importer in this case.
Castrol have also been known to recommend a different viscosity to the manufacturer!
I'm not casting aspersions of dealers or Castrol - just going from my own experience of Vauxhall, Subaru and Hyundai.
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