Congratulation, that's a fabulous effort! I'm always impressed how fast genuine race walkers travel - much faster than I can run just for starters!
Indeed you must qualify and enter the Olmypic trial event - they are fabulous occasions and to be honest, many of the trial events are better than the real thing ... not sure why exactly, but there seems to be a more festive feel to them, and certainly over here anyway they were extremely popular. Perhaps because they were free for spectators and everyone is keen to see how the course/facilities check out. Great fun! Even in your cold climate!