Dave Rouse (jnr) has drawn to my attention the website via which you can soon enter yourself in one of the long distance races (from 17k up to 150[?]k) that he, Dan, Gary P and Ed entered this year. You could book yourself, and/or your family, a holiday in the Canaries at the same time. The website is: http://www.transgrancanaria.net/en/; start training, and saving up!
N.B. The event takes place in early march, not July.