Thank you all for your help and Iain Stanford for his e-mail.
The Frederick, Duke of Schomberg's Huguenot regiment of 9 troops (3 squadrons) was dressed in light grey coats with red cuffs and buff breeches with yellow buttons & white hat lace. Taken over by Henry de Ruvigny, Viscount Galway after Fredericks death at the Boyne.
The Duke's title then moved on to his eldest son another Frederick who himself was killed at the battle of Marsaglia in 1693.
The Count (Meinhardt) 2nd eldest son who was present with his father at the Boyne and commanded the Schomberg horse under the British establishment inherited the title in 1693, but took to colonelcy of what would become the 7th Dragoon Guards from Lord Cavendish on the 10th April 1690...Red Coats, Black Cuffs/Vest, Buff Breeches, White Hat Lace, Tin Buttons, Buff Shabraque with White Trim.
Meinhardt and his regiment (2 squadrons) were at Blenhiem in 1704 within Palmes Brigade (5 squadrons) these successfully charged the French Gendarmerie (8 squadrons) first recoiling them then routing them.
Great stuff.............Ray.