Hi JackOakley, when interdicted you'll definitely know about it!
First off there is a pretty loud set of FX that play and the screen gets a blue aura around it, then you'll see an "Escape vector" (think the same vector graphic that you see when stuck in the gravity well of a star) usually this vector will fly off to the top right of the screen (not always) you have to try and get the cursor into this escape vector and follow it around as it moves. The closer you are to the escape vector -preferably on it- the better you are doing vs the interdictor.
I don't have a tutorial to link you but it should be pretty obvious what you have to do when the time arrives, important things to remember are if you try to avoid the interdiction and fail you'll take 2% damage to your hull and be pulled out of cruise or you can decide to submit and this is just a case of slowing down or pressing j.
When/if you fail or submit its worth also noting that you'll be usually very close to the interdictor and a slight ramming will take place..so make sure to fly will full pips to shields/systems when cruising.
Gl out there commander!
