Hi Kelly,I did this a few years ago, i didn't really do any specific ultra training just a few long off road runs of about 1hr 45 to 2hr 15 along the Saxon shoreway and in the North downs. I think speed training is more important for me, i tend to think if can do 6min miles for shorter races then i could run 8min miles for an ultra race and it would be like a jog.
I found that because I was going slower than marathon pace and could eat and drink each lap, that i didn't hit the wall and found it really comfortable compared to marathons.
I tried to think of it as being on my feet for 7 hours rather than 52 miles which i think helped mentally. I drank a can of full sugar coke at the start of the last lap as well which gave me a boost.
I didn't try and keep up with anyone and just went at my own pace, then picked off the leaders over the second half. If you get caught up racing someone and blow it's a long way left to struggle.
Im about to move house and have several boxes of old 220's, triathletes and cycle sports form early/mid 90's plus various running mags if any one would like them they are free to anyone able to collect them from ashford kent, would possible be able to drop off in south east kent area