Well I have been looking at the Perry AWI British Infantry on my bathroom shelf (my prime 'painting project viewing' position, despite the wife's protestations) for quite a while now and I have come around to the unsavory conclusion that I did not like the back rankers "poses". They were a little too lackadaisical for my liking. A bit 'camp' Boy Scout not really meaning anything, just lumbering along holding a musket in one hand. Luckily the Perry box has a huge amount of variant poses, so after a few surgical 'arm breaking' they were recast with more menace (see below):
Looking at the spares still left in the box and I see that I can do the same again for the other regular line unit, maybe short by one pair of arms (the six lights in forage camp were already advancing menacingly). All-in-all still worth the faff for the end result, especially as I will have have to contend with Renko's elite 'well painted' troops when I finally get round to playing agame of Muskets and Tomahawks.