A chief bridesmaid is the maid or matron of honor. You can have one of each, and as many additional bridesmaids as you want--there are no rules. However, too many can look ridiculous and make taking...
Generally the maid of honor in a wedding party is either close to the age of the bride or even older, but there is nothing written in stone where the maid of honor cannot be younger than the bride.
"The honour of your presence is requested" is very formal. If you're being less formal, go with "honor." Either one is fine--just think about the tone of the wedding.
An honours degree generally requires more credits (and thus more courses) to graduate than a "general" degree, whereas graduating "with honours", I believe, is based upon maintaining a certain...
You say "a hounours degree" If you actually pronounce the 'h' when you say it. Not many people do that, so you say, An honours degree'. Just like saying 'An onours degree' With no 'h'. And since 'o'...