In response to a few enquiries about ancestors at Waterloo, I have a completed database of British combatants in the campaign of 1815. It is compiled of all WO97 (discharge documents), WO12 (pay musters) and WO25 (casualty rolls) kept at the PRO at Kew. In addition there is masses of biographical information from a number of other sources including regimental museums and the National Army Museum.
There are 39,000 men on this database and it is possible to search by name of the individual or place.
The database has also been crossreferenced with the medal rolls for both Waterloo and the the MGS (Peninsula medal).
I will be happy to answer any queries and would also be very interested in receiving any information on individuals which I might be able to add to the database.
The more the merrier!