For a valid marriage to have taken place in England or Wales, in the eyes of the Courts of England and Wales, a marriage ceremony must take place in accordance with the requirements of the Marriage Act 1949 (as amended from time to time). The basic requirements of the Act are as follows:
The question whether you have a valid marriage is important both to the rights in respect of any children of a relationship and also in relation to the finances. For example, if a father is not named on the birth certificate and the parents were not married then the father has no parental responsibility for the child without agreement or a Court Order and has no right to authorise medical treatment of the child. More often the validity of a marriage is challenged in divorce proceedings to prevent the Court having the power to divide the assets or when somebody dies and there are issues over who should inherit their estate (as well as whether the estate has to pay inheritance tax).
Where the marriage takes place abroad it is recognised in England and Wales, provided it complies with the requirements of the jurisdiction where the marriage took place (i.e. formally valid), even if it would not have complied with the law of England and Wales. It must have been celebrated in accordance with the requirements of the law of the country where it took place or (as an alternative) in accordance with the requirements of English law. Where the validity of a marriage is questioned evidence may be required of the requirements of the jurisdiction where the marriage took place.