On closer inspection of the hi life site, it looks like the hi life essentials turkey and giblets (the one I'm after) might not be discontinued after all. A lot of the hi life are being discontinued, including the petit pate, but there is a pic of the hi life essentials but the pic is of the salmon pate. I thought for some reason that was the only flavour being kept but if you click on the picture it comes up with all 3 in the range (turkey, salmon and tuna) and it doesn't say discontinued for any of them. I also managed to find it in Asda today (I bought every tin they had!) although it does look like the other supermarkets won't be selling it any more as it's the petit pate brand that most used to stock (I still think it is exactly the same as the essentials as both ingredients list and nutritional analysis are identical plus it looks exactly the same, right down to the little bit of "skin" that sticks to the bottom of the tin!).
So hopefully all is not lost and Mosi can still have his turkey and giblets pate that he loves.