Would the below be sufficient as reps? Realise I've left it quite late, unfortunately time got away from me completely!
Dear Sir/Madam
I am writing with regards to PCN TK03017674. On arriving at the bay I paid for parking until 11.01, I was attending a meeting which was due to last until 10.30 and was conscious that this time allowed for any overrun of the meeting. I left The Community House at 10:55 to make my way back to my vehicle, according to Google Maps the bay in which I was parked was less than 100m from The Community House and therefore there was ample time for me to get back to my vehicle. However, as I was exiting down the steps of the building I slipped and fell, twisting my ankle and injuring my knee. One of the Trustees of The Community House who I had met with came to my assistance and took me back into the building to administer First Aid, including cleaning my knee and strapping my ankle. After First Aid had been administered I made my way back to my vehicle, arriving back to it around 11.18 which was the earliest that I could do given the unexpected delay, injury.
I also attach a letter from The Community House confirming that I attended a meeting there, and that they administered First Aid as a result of me slipping on the steps when leaving the building.