Mate looking at yer stats over on Strava that's a decent run, lots of hills in the equation, you will feel the benefit of them when you come down to the flatlands of south Manchester for the half mara.
I would say you will easily go under 2 when it comes to the race, maybe if your concerned about speed do a couple of short interval sessions, nothing major, maybe 5x 400? Or even a few fartleks, short sessions like that should boost your confidence and make you feel more comfortable about getting the time your after.
East Cheshire harriers do Tuesday night interval sessions on the cycle track, it's £2 and you can just turn up, that would definitely help, let me know if your interested and I will get some more details off my mate,