i think there was a medical tick box on the sign up form. I did this last year and in for this year too, it is such a great event, organisation and atmosphere - and a cracking t-shirt.
Phone any of the factory shops in Cumbria (Shap and Flimby) the staff are very knowledgable - they will be able to tell you the equivilent NB to your current trainer, if if there are any sales on and they are happy to post out too.
Done this a couple of times, its not too big and as expected well organised via BUPA if the course is the same, it is a bit dull, out along a dual carrige-way and back - with a killer hill up to the finish. Enjoy.