The Bloke On Who Wants To Be A...
Film, Media & TV2 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.She can track down her husband searching the electoral role. There are web sites that provide basic information for free. Put his full name into the system and see what comes back. There will, probably, be a fair number of "possibles" if she doesn't specify a geographic area, and of course it will only work if he is actually on the electoral role.
It does seem unfair that someone who never contributed to either the family home of the welfare of his daughter should profit from this, but sadly that's the way it is.
The divorce should not have been made absolute without the financial aspects being settled - including who was to have the house, or in what proportions it should be shared. It is not necessarily 50:50 - it depends on the judgement of the Court if the two parties did not agree. She needs to go back to the divorce documents to see what they say - if necessary go to the solicitor who acted for her in the divorce. If it is anything other than a 50:50 split produce the document to the bank as evidence.
There doesn't seem to be any logical reason why the bank should keep her share until the ex is found. She should get the bank's formal complaints procedure and follow it - going to the Banking Ombudsman if necessary. When they do pay it to her, they should add interest from the date they had the money up to the date she gets it. (Alternatively, if she can get legal aid or can afford it she can ask a solicitor to take it up with the bank.)