Apologies for the late reply, but I've seen different figures to those (will try finding them now), with the target down to 2.0% I think. Where were those numbers listed?
In the first issue of their magazine given out to everyone.
I suppose to get things down further, you need to step up onboard checks (to look for other offences like people travelling beyond their ticket validity, or doughnutting) and that the gates are in operation all the time - and without easy ways to avoid them (going in/out at another part of the station, or obvious weak spots where people can jump walls etc).
Even Hatfield, with high fencing like a fortress has areas where street furniture and other things to hold on to has people jumping over. Gates don't catch them, although I suggested many times to FCC that a simple solution was anti-climb paint. Cheap and effective, as that stuff doesn't come off. Suddenly some scrote leaping the fence and ruining their clothes and shoes might think twice.
Will Govia consider these things, or just hope gates are the perfect solution and by not checking much further, you can claim anything you want as if you don't know someone doesn't have a valid ticket, you don't need to record them in any figures.
as there'll be no return fares.