Had a go at making the leather seats more presentable at the weekend.
This is using the Gliptone / Scuffmaster Liquid Leather touch up kit, which for the option I selected gives you 4 products:
20200507_134346.jpg
Used the cleaner first which did remove a fair amount of grime (even though I've cleaned the seats previously using baby wipes), then went over them again using the degreasnt - which didn't seem to do much, but I didn't really have any marks/stains to come off, as is the intended use.
Then applied the dye by squeezing onto a lint free cloth and dabbing onto the most obvious areas which needed attention. Initial impression is: hmm, that was a wasted of money, it doesn't actually cover anything. The weekend was very warm so the coats dried quickly, so as I worked my way around the driver seat first, I kept going back to the really obvious marks and adding another layer every couple of minutes. By the time I'd finished a general dab over the seat (takes a good long time), multiple layers had been added to the bad scuffs and marks - and they have actually come up very well indeed. The single most obvious mark on the bolster has basically disappeared.
Before:
Base before.jpg
Base 2 before.jpg
Bolster 1 before.jpg
Bolster 2 before.jpg
Base 2 before.jpg
After:
Base after.jpg
Base 2 after.jpg
Bolster 1 after.jpg
Bolster 2 after.jpg
Bolster 3 after.jpg
I let that dry for 24 hours, then used the final conditioner product - nice smell (have used this one before) and once that had dried (took a day again before that was truly dry), the job is finished.
I used less dye on the 2nd seat, partially because it was in better condition, partially becuase I'd had enough of doing it

but now I know how well it works and how simple it is to use, I'll probably have another more methodical go in the futuer (and use it as an ongoing maintenance task to keep the seats looking decent).
I note on the website that the dye bottle is now 250 ml, whereas before (and as is printed on the label!) it only used to be 60ml. I've probably used 2/3 to 3/4 of the bottle and have only completed the seats - not really 100% coverage - and the arm rest; the rest of the interior (I have the extended leather option) remains to be done if I'm truly being picky, so will probably pick up another bottle of the dye on its own.
At this point in time then, I would heartily recommend this product.