My friend is an Indian citizen and her ex-husband is NRI (residing in London, UK) for 2 decades. Both of them are Hindus. However, they were married in India and the same was registered in India in 2019. They have a marriage certificate as well. In 2020, they got divorced by mutual consent in London, UK. They have also received the decree for the same. Kindly let us know if the same is valid in India, or should she file an afresh application for divorce in India? Also, how does she cancel her marriage certificate and re-marry basis this?