Divorce Solicitors in England, especially those like us who deal with a lot of expat and international divorce, are increasingly asked if a divorce abroad or indeed a marriage abroad are "legal" in the UK.
The relevance of a marriage abroad being legal here is, perhaps obviously, a very important issue if one of the people involved wants to remarry here. Also often a person may want to divorce here and make the financial claims possible here only to be faced with a claim that they were divorced in, say, Bangladesh years before by a talaq.
And even if they can get a UK divorce, most Muslims will understandably want the marriage ended in the eyes of their religion too.
Take a look at this free article on the important subject The Validity of Talaq Divorce in the UK