AS to reserching your family Mc/Mac Donalds in Ireland you best off with going to FHC/library for info and getting films. Knowing the town land etc. will help you in searching thru the films and then sending for copies if you want. Films are stil easy to rent but check first to see if they have them on file. As to the BMD site it is mainly England only! Tho there are many Irish who went to England to live or to stay before they could come to USA during famines ( as in my family case) Many stayed on and raised their families there and you just might find ancestor. It will depend on what year you are looking for as not all counites and years, are on the BMD line as yet. Middlesex has little info so far as compared to other counties. I was lucky tho as I found my GGG parents both born n Cork in the BMD when they died, also found grand aunt and uncle as to marriage and deaths. Remember to tho there may have been children of yur ancestors they may NOT have registered the birth, many of the Irish never did since they didn' trust the English records. Good luck!