Re: the question about grenadier caps, I believe the grenadier companies and musicians in all British Army regiments of foot retained the 1768 regulation bear-fur grenadier cap throughout the Napoleonic period, but these caps were customarily left in stores for active service, when the grenadiers wore the same headdress (feather bonnets for Highlanders) as the battalion company men. The distinguishing marks for grenadiers were the "wings" on the coat, the color of the plume (white for grenadiers), and the wear of rank chevrons on both sleeves for NCOs, although this may have varied by regiment. After the Napoleonic War period ended and garrison duty resumed, the fur grenadier caps (enlarged!) came back out for dress parade and were retained until flank companies (grenadiers and light bobs) were abolished sometime in the 1850's.