Well that was an hour well spent, thanks Adrian
I spoke to my independant who bought and fitted the washer pump last year (a year to the day as it happens) and explained the issue I'm having. They checked the invoice and had bought it from TPS so they contacted TPS and confirmed it has a two year warranty but can only be replaced under warranty if the work is carried out by an Audi main dealer. The independant contacted the main dealer on my behalf and confirmed that they'll carry out the work F.O.C provided I provide proof of purchase of the defective pump. So, it's booked in for next Wednesday and will hopefully be sorted then.
Is this "standard procedure" because it seems too good to be true, especially where I'm concerned? I'm told if the value of the part is less that £50 they'll simply exchange the defective part for a new one but if the value is above £50 this triggers the requirement for the work to be carried out by an authorised main dealer. I don't recall reading any other examples of this on here but maybe it's the sort of thing you only see if you're looking for it. Regardless of that, it's good information to know and share, I for one may be about to benefit from it
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Audi D3 S8 - 2007 - V10. B&O, Phantom Black, black and silver interior, and still completely standard with everything working as it should

SOLD 2023
Audi TT - 2015 - Ultra