Posted: 19/04/2014 at 15:17
You have loads of time. As above but another option would be follow a 12 week plan but do each week twice, but increase say the long run by 1/2 a mile rather then a full mile so your weekly increase is shorter.
Good luck!! You have picked a good half marathon, not run it but have heard loads of good reviews and if the support and atmosphere is anything like the marathon, you'll find this a mager help with energy and spirit if you feel like you are getting tired.