Yes Fifteens Away, they are Black Hat. I've taken to using the name of their new owner because that's who sells them now. I hope I don't cause too much confusion.
Lancashire are always a good outfit to deal with but their Sikhs are marketed as 18mm. You might find most of the Irregular Miniatures 15mm a little short by comparison. The Irregular Miniatures Khalsa regulars in Summer Uniform are the largest in their range so might be the best fit with Lancashire. Good luck with your collection.