Why do I need somebody to do inspection and testing?
If you find that you seem to be getting a lot of electrical issues over a time then it might be a good idea to get an MOT done on your electrical installation. Not only for peace of mind but it will also highlight any areas that could do with attention. A common occurance is poor earth or worse even a missing earth on parts of the system. With a non-existant earth conductor part of or the whole of a ciruit may not be protected by the RCD (Protects against shock). A full test will show this.
Are you a landlord?