I was beforehand digging this and found UK organization quite interesting to say at the least. Complied a basic list: Typical British Line infantry regiment with a single battalion had typically the following when speaking of officers:
1 Colonel (often not present as colonels were generals and were more of ceremonial heads, some exceptions still)
For the Battalion:
1 Lieutenant Colonel (often the leader of the regiment or the battalion, especially since regiments operated as single battalions with second as a reserve)
Then each company, again usually, had:
1x Captain, 1x Lieutenant & 1 Ensign.
Also difference in flank companies often was that they didn't carry colors, thus Ensign was instead an additional Lieutenant. Based on what I was looking on at Loyalist muster rolls in 1779 they usually seemed to (atleast way back then) have 3 Serjeants and 3 Corporals. 2 Drummers was usual as well.
Found some interesting read on these:
About reforms during Napoleonic Wars which included more lieutenants and NCO's for larger companies, good sources:https://rodwargaming.wordpress.com/miltary-historical-research/organisation/authorised-establishments-of-the-british-army-1802-1815/
About Continental Army, but still has British organization circa 1775.http://www.historycarper.com/1982/05/01/the-continental-army-chapter-iii/