Gliptone Leathercare was based in Todmorden in Lancashire.
I visited them just after I bought my Maserati for a colour matched scuff repair kit, which they used my rear centre armrest as a colour sample.
I guess they must have been bought out, as not based there anymore according to their present web site.
I use their conditioner on the Maserati seats which works well, however some leathers are 'sealed' so well that it is believed their conditioner does not work. I actually use a dodo juice leather sealer type product on my BMW seats, that don't smell of leather at all being 'sealed' so well.