I also took seriously the responsibility to provide a voice for the world's best and give crucial elite athlete feedback on the proposed route.
I was flown in to London especially by the International Paralympic Committee (IPC) and London 2012 race organisers and set out on a course which will take competitors past many of London's historic sites, including the Queen's residence Buckingham Palace.
Fitting the test event on to my schedule was tight as I was competing in Switzerland the day before the test event.
I had literally just finished the 10,000 metres and posted the second fastest time in the world so far this year in 28 degree heat. I was then selected for random drug testing immediately after the race. Following the test, I hit the shower before going straight from the track to the airport.
I was briefed that same Sunday night by marathon organisers and was on the course start line 7am Monday morning.
The proposed route begins with a two mile loop, then an eight mile loop which athletes circle three times. The finish, at The Mall in front of Buckingham Palace, is similar to the Virgin London Marathon finish, which I won in 2010.
The rest of the course is very technical with a lot of turns through the central London roads.
After completing one "examination" circuit in my race chair, I then got in a car with delegates and organisers to drive around the course again, providing feedback.
I told them that the course backdrop will be great for television, following the athletes around many historic landmarks.
However, there were some areas that would be very dangerous for wheelchair racers - sharp turns and bottlenecks in the road - who are travelling at a much greater speed than the runners.
There are also some very rough areas of road or cobblestones that would puncture tires easily - something that could potentially cause great disappointment for the world's elite.
I was very pleased that the delegates and organisers were so attentive and appreciative of my feedback and I am confident that they will make the minor changes I suggested so we can have a great marathon race on September 9, 2012 – the last day of the London Paralympics.
But even with my proposed changes, the course will still be inevitably technical on the narrow winding London roads.
It's going to be a very tough course and the times are going to be slow. It will make for a long and gruelling battle until the end!
But it was just so exciting to just be on the roads which will be the setting for what will be one of the most memorable events of my life.
I am also very glad that the IPC and London 2012 organisers are determined to make their course as suitable as possible.
All concerned will be mindful of the controversial 2011 World Championships Marathon in Christchurch, New Zealand, this past January where the surprise announcement the night before the race that the marathon route would be open to traffic resulted in the Canadian and British teams pulling athletes like myself and my good friend from England, David Weir, out of the potentially dangerous event.
Paralympic wheelchair racer Josh Cassidy is set to be one of Canada's biggest medal prospects at the London 2012 Paralympic Games. The 26-year-old from Ottawa was left in a paralysed after he was diagnosed with neuroblastoma, cancer in the spine and abdomen just weeks after his birth. He has gone on to compete for Canada at the Beijing 2008 Paralympic Games and arguably his biggest victory came when he won the 2010 Virgin London Marathon