Thanks for the recommendations all.
I was resigned to having a go doing the repair myself as I wasn't sure about getting it done on time and actually getting to south of the river.
Since I had to duck out of work, I headed out to the nearest shop to me, Airborne, to buy a tear-aid kit, well two to cover myself for further stuff ups.
I mentioned to Damo that I had the kite in the car and asked him for a bit of advice on the tear.
He had a look and decided to fix it for me on the spot, after which he pumped up the kite to make sure the bladder had no twists in it, and showed me a few things to check in regards to replacing leading edge bladders.
All off his own back!
So this is a big shout out to Damo, you are champ, really helped me out and the extra unexpected service was much appreciated.
Enjoy the beers mate