However with the aid of Rafael Pardo's post:
And the great work done by Paul Alba:
I settled on repainting them as the 3rd (Brandenburg) Uhlans.
The figures were already painted, not sure if they were by Dragon Painting Services as the technique looks different. I left the horses alone and concentrated on painting facings and patching up chips and straightening lances as well as the standard rebasing. They have come up a bit glossy in the photos. They make an interesting comparison to Paul's figures which appear much cleaner (my guys lack facial definition for example) and Paul has done an excellent job on the buttons.
I had on guy with saddle sores, but it just didn't look right so I pried him off and re-glued him.
Getting lances straight is hard work. I've given these a double coat of PVA glue to strengthen them as they had seen a lot of bends.
Getting the figures to "sit" on the horse had also been a battle.