Cashback did not track, so had to put in a claim. Cashback declined.
No reason given as to why, and there seems to be no way of taking this further.
To add to the insult, the product was decidedly average for the money anyway.
I've added up that I've spent in excess of £500 with this company in the last 3 years, but this will certainly be the last time I shop with this retailer, as their products have gone very much downhill in the last year or so, whilst the prices have gone up!
Next Christmas I will look elsewhere, and I suggest you do too!