There are number of issues here. Firstly it is totally illegal to place a recording device in property occupied by another as has been done by your brother. If it is for the purpose of trying to extort money from you, that will be a criminal matter of great severity. As such it should be reported to be police. If there are problems in preventing you from doing this there are certainly remedies available through the civil courts.
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• Get a divorce
• Have contact with my children
• Make a small claim
•Write a letter of claim
•Obtain a Grant of Probate
•Get legal advice and help with my case
•Make a Will
•Change my Name
•Prepare a legally binding agreement
• Sever a Joint tenancy
• Prepare a Partnership Agreement
• Sell a Jointly owned Property
• Appoint a Guardian for my children