"One thing I find very frequently is that our Americans cousins rarely use the word too. eg I am too full to eat another bite.
It always seems to be spelt "to" which has a different meaning."


That isn't so, Grumble. The use of the word "too" as you define it or use it here is indeed alive and well in the States. A few people may be mispelling it as "to" by mistake, but that's just because they've forgotten their spelling/grammar rules they learned in school (not that I'm singling out TeddyBear [smile]). I edited medical books here in the States for 24 years; believe me, the majority of us definitely use "too" just as you do.

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Communication is the key.