Advice on buying a SCOTT SUB Sport 10 2014 I have been looking at the Scott SUB 2014 as a potential candidate for my cycle to Paris (approx 90 miles) and a cycle across the South Downs this summer. 

Having such different terrains, I was wondering if anyone has any insight as to the quality of Scott bikes (never owned one before) and suggestions as to if you think this bike would be fit for purpose.

Would love to hear your thoughts, full spec can be found here.
Scott is a fine brand. The most important thing is how it rides and fits for you (this is a highly personal decision on your end). 

For a 90 mile ride though, you may want something with drops (with a relaxed geometry - something like a Trek 520 wouldn't be bad for this purpose, for example) or a flat bar with bar ends or a trekking bar or something for multiple hand positions if you're taking the 90 miles in essentially 1 or 2 shots. However, I'm not familiar with the particular European terrain, so I'll defer to the Europeans.