Good to hear from you again! Sounds to me that your nearly new top-of-the-range Freelander SD4 was a good buy.
There were a couple of feature articles fairly recently in DC on diesel fuel and additives, which might add to your knowledge bank, if you haven’t read them (Issues 345 and 348, Ed).
I think that you are currently doing exactly the right thing. By using an aftermarket additive at an effective cost of probably around 4 to 5p a litre on top of the pump price, you are getting a top grade fuel for a lot less than the cost of an overpriced branded fuel, like Shell V-Power or BP Ultimate (The extra money goes on all the heavy advertising, I would guess!).
This is pretty much what I use, although at times I have used Tesco standard diesel plus an additive, and it seemed to work well enough for me. I do think that, after some criticisms of fuel quality, some supermarkets have upped their game, but I don’t know whether the picture is consistent throughout Britain, as fuel quality is dependent on what your local bulk distribution depot offers. My local Gulf station has started price-matching to the local Tesco prices, and that’s what I’ve been using for the last six months plus (Tesco is no longer offering extra money off – up to 10 to 12 pence per litre – from credits that you earn from buying groceries there).
It would not do any harm to double your dose of additive maybe every five fill-ups though, if you have been doing a lot of local running around, when the evil deposits can build up in the engine and its fuel system. Anyway, I hope that puts your mind at rest, and I hope that you continue to enjoy your Freelander, which should keep you happy for a few years. Regards,