Hi Guys,
Just a follow up on the post....
I repaired the waders using 'Aquasure' (many thanks Syphogenic...

), just basically used half the tube on the inside, used half the tube on the outside, letting each side dry 24 hrs. There was no special preparation, I simply smeared it along the seams ensuring I covered well beyond where I had seen the leak starting.
Anyway, it worked a charm...spent all last week on Corrib, hopping in and out of a boat and did some wading most days too, and not a drop got in!
Think it cost me all of 7 quid for the aquasure and postage from e-bay, so it was definately money well spent...so thanks again for the tip!
Regards
Dave
PS....I did contact Scierra Denmark, but as expected, without a receipt or proof of where they were purchased, they couldn't do anything...fair enough I suppose.