How can anyone do a viual inspection, free or otherwise, and say weather the installation is safe or not
If a visual inspection is all you need then why do we have testers and are required to fill in test sheets.
Maybe sometimes you can walk into a property see an old wooden board and vulcanised rubber cable and know that it requires a rewire.
Just because a board requires replacing it doesnt always mean that the property needs a rewire and in most cases the only way to determine this is to carry out a full inpection and test using the appropriate test instruments.