@SuperV8, thanks for putting all that investigative effort, your posting has caused me to halt considering buying ATE 13.0460-7294.2 just in case it really does not have that SS shim on the outer pads - and it can't accommodate me fitting the shims from the factory fitted pads.
I have approached my usual online VW Group parts supplier for a price for what I could see from online parts listings, as the correct pad kit, which is still listed as 3Q0 698 451E and he reckons that that is a very old part number, and it has been superseded - but he didn't say what the latest correct part number was, also, as he tends to trim a bit off the prices, and so to compete with VW Group main dealers, he has quoted a price of £75 inc VAT, so with P&P of £6 that makes it £81 for me to buy - which is really why I'm looking, in this case, for any possible alternatives, both the suggestion that the part number that I've suggested is out of date and the final cost is a bit higher than I'd expected when buying "at discount" - in all the years that I've used a couple of online VW Group parts listings, I've always found that they were up to date part number wise - except now.
It is good to hear that maybe VW Group have changed the friction material and that should improve life for the rear discs.
Maybe time to give up on trying to get a better deal/product and buy locally from my SEAT dealership.