You're welcome, and I was just thinking that if your friend wanted to buy the certificate out of curiosity, there'd be nothing stopping her, but of course now I think about it a bit more, there would. There are restrictions on ordering birth certificates from the GRO for people born less than 50 years ago - to actually order the certificate your friend would have to supply virtually all the information which is on the birth certificate in any case, including the mother's and father's forenames, so it would probably not have been possible. Ordering the certificate from the local King's Lynn register office might be a different matter, but I just thought you'd be interested to know that. :-)
Christine