IIRC, about 1/3 of Wellington's force was British. I do not have the figures for Irish troops, although I could probably find them. One thing is certain: there were no Scotch troops - only Scots or Scottish. They are very particular about that.

I fear Don has misunderstood Niels's comment. It seems to me that N merely speculated as to what Hitler would have written if he had survived and been kept in circumstances similar to those in which Napoleon was, and had been able to give "his side of things". AFAIK it is estimated that there were about a million of what might be described as civilian casualties during the Revolutionary and Napoleonic Wars. Not sure how that compares pro rata with WWII.

Enjoyable as a "what if" on Waterloo would be, I'm afraid I'm not really qualified to take part. My knowledge of the wider political situation in the early-mid C19th is not up to it. I gather that Napoleon hoped that the alliance against him might break down under the strain of competing national interests, but how he might have profited from such a situation we can only theorise. Would he have settled for a non-expansionist France? Would he have been able to resist taking up cudgels again? What would have been the effect on German unification and expansion? I'm sure authors far more informed than I have expressed their views.