Les Ward
Hi Stacey, an electrician undertaking work of this scope should usually be registered on one of the Part P schemes run by organisations like NICEIC and NAPIT as this work is subject to building control regulations. Electricians on these schemes will provide an Electrical Installation Certificate on completion and you will have an insurance backed 6 year guarantee against poor workmanship. If the person or company who did this work is not on one of the Part P schemes and has not provided an installation certificate you have no guarantee that the installation has been installed and tested to an acceptable standard. Probably your best course of action is to get a second opinion from an onsite visit from an electrician qualified to test and inspect installations.