Petra raised a grand total of £900 for two charities: Brain Tumour Research and Action Against Cancer.
Petra chose these two charities as they are very close to the hearts of her and her friends and family.
Team TD made sure Petra was not alone for the marathon and she was joined on the day by Kate, Andy, Caroline, Gail, Karen and James at various points on the journey (and of course a celebratory glass of fizz and a Krispy Kreme at the end).
Petra completed the marathon in a very impressive 4 hours, 32 minutes and 20 seconds. Huge congratulations once again, Petra!