I have been creating a comprehensive list of all Regiments, Corps and formations of the British Army between 1793-1815.
The intent is to not only list all the units but also provide details of establishment, uniforms and life span if possible.
The list is currently work in progress but currently has:

Infantry:

Regiment of Foot Guards
Regiments of Foot
Militia
Fencibles
Volunteer Infantry

But when finished I hope to have also all the foreign regiments, colonial regiments, all cavalry forces, artillery.

I also have a separate list of all the Regiments of the Honourable East India Company 1793-1815

I intend to make a excel document for each year 1793-1815 with all the units unique to those years, but this will take a long time to create.

Visit my blog (via the link) to see the excel current document

P.S
Feel free to help if you have information on any of the parts that are missing, all contributions are welcome.

Cheers