I have the same matt, I know you can do a DIY repair, but personaly I would send it of to Cascade in Ireland, if your lucky they will fix it under the life time warranty, if not it could still be worth paying for a pukka repair, I would imagine a new matt is around £80 these days.
I've just repaired a two inch cut on my sim using McNett tenacious tape, I used the clear tape and you just cut a patch about one inch bigger all the way around the cut, you round the edges and stick on. I left it overnight before inflating and its perfect and apparently the patch gets stronger as time goes bye.....
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A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets