It has taken a while to get round to it but managed to repair the seat Today. I have stitched it back together with 2.5mm copper Socket cable drilling 3.5mm hole either side of the crack. I have also replaced the two 6 mm foam pads under the seat pan that gives some support & refitted the other foam blocks that had come astray, possibly the main reason the why seat cracked in the first place. I did consider using some kind of epoxy too, however being an ultra orthodox Yorkshire man, I figured to much of an expense if this approach failed and I would have just end up buying a new seat pan, so save myself a few quid into the bargain.
Re fitting the seat was a breeze with the aid of double sided sticky tape and a long draw bolt, less than 10 minutes and that is not an exaggeration. It takes my weight and there was no creaking or cracking so hopefully jobs a goodun.
It's a bittersweet result! as I have decided to quit paddling due to Injuries sustained as a result of my Army service. Sitting down for long periods has become painful even driving for long periods is not much fun, and sitting in a Kayak can be excruciating, You can not get out and have a rest and walk about in the same way as you can when cycle touring, and I defy Gordon Brown to walk on water! Hopefully my repair and the seat refitting technique will help someone, it will certainly make seat adjustments simpler.
Cheers all Andy.
