An EICR carried out by an experienced competent person is without doubt the best way to go. You can never judge by just looking at an installation photos or otherwise. I have seen installs that have looked neat tidy and compliant, and then its turned out to be lethal.
As an example, a 6 year old property, client said getting shock from shower !! RCD not functioning, cpc from isolator to shower was floating, and the element had gone down to earth, plastic pipe to the shower. Said he had a tingle when in the shower and his elbow touched the tiles. His wife said she felt like it was a static shock like when you touch a car bodywork, when she turned the shower off !!
One of the worst real life examples I have encountered, and lets be honest a fatality waiting to happen.
Sorry !! I have gone off topic here but just wanted to point out what can happen and why EICR,s carried out properly are so important.