Neatsfoot oil - a light application using an absorbent lint free cloth - then a similar cloth to remove any unabsorbed oil and buff the surface so dust and dirt don't stick.
A glycerin soap is good for surface cleaning, Saddle soap has glycerin as well as neatsfoot and lanolin some versions have bees wax added to seal the leather.
I think each as a separate application works best.... Clean with the glycerin/lanolin soap, then apply neatsfoot oil, allow to dry then apply a dilute mix of neatsfoot and bees wax to seal. Makes for clean & shiny long lasting leather goods
If I could avoid the lanolin I would unless the leather has hardened and I want to soften it up. Lanolin makes shaped leather too supple and tends to let it lose shape. So if you can find pure glycerin soap (which is what I use most often, though I have Saddle Soap too) perhaps it would be better than "Saddle Soap" for some items. I find it at the local tack store or you can order it on line....
There are some general rules for application of neatsfoot oil to leather that were published by the US Cavalry as a manual in the 1860's or 70's, I think the British also have a similar publication on the care of leather goods - I'll see if I can locate them on the web and publish the link here later....