I've just taken about a years holiday from actively trying to get the whole of my adoption file and records of how I came to spend time in care, this has been a 17 year fight so far, I'm about to have another go at getting some more.
I feel a bit like Oliver Twist, asking for more all the time I have the luxury of living in country where we adoptees have had the RIGHT to have a copy of our original birth certificate since 1976 (original in every respect apart from having "Adopted" typed or written in the margin).
Scottish adoptees have always had that right since the first Adoption Act there in 1930, they can now have their birth records unsealed when they are 16, the rest of the UK it's 18. If you were adopted before 12 November 1975 in England & Wales they try to make you have some dodgy "counselling" with a social worker who probably doesn't know much about what it's like to be adopted or to have relinquished a child for adoption.
I was one of the lucky ones who had access to the Adoption Order that has my original name on it, so I could have gone to the Registrar of Births, Marriages and Deaths in the area I was born and got a copy any time I pleased, so I did.
It's always been up to the adoptive parents here whether they give their adoptee the information that is on the adoption order http://ao.postadoption.info