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Yes, I have come across that explanation before, and to be honest it confuses me all the more. "When too refers to the subject of the sentence"... what does that mean exactly?

Having cracked defining and non-defining clauses, I am still a tad confused as to why some sentences ending with 'either' have a comma before the 'either' and some don't. The same applies with 'too' at the end of a sentence; some have commas before the 'too' and some don't. I can't work out the dist...

Thanks very much, Nikita. I kind of cracked it before I read your excellent posts, which just confirms things. Essentially, anything parenthetical requires commas and non-defining clauses are parenthetical remarks in a bigger clause.
Again, thank you.

Can anyone explain the difference in layman's terms?

Thanks