I see where you are coming from. The photos show a right mixed bag of uniform elements/anachronisms, it makes you wonder if the historical researchers did their job.
He's wearing light company wings and sergeants stripes on both arms, both light company indications (stripes should be backed with facing colour too), fringes are a bit bushy too.
He's carrying a half pike which was only for centre companies.
Not clear whether the stripe on the sash is white or yellow, should be the latter.
I realise this was a non fictional regiment in a TV series but I just just gripes me that with all the info available (even in the 90's) they should have made a better job of it.
Sorry for the rant.
Melanie