Thank you for the advice on the Race Glaze leather care kit.
The seats were pretty shiny when I got the car and initially wasn't sure about the condition of these.
Using the above kit as described has cleaned these very well. On conditioning them the seats are back to a normal colour after the initial worry that this product too was going to leave the seats shiny. The seats seem like they will need another condition to bring them back to their best.
It seems like the previous owner had taken care of these seats but perhaps not used the best of products on them.
Thanks again for the products and advice.