Oh come on, the man's an expert in his field, has obviously built up a reputation big enough to be brought in by several police forces in the south and south east of England in these types of cases, has spent twenty odd years studying rivers and waterways, how they behave and how bodies behave within them. He has specialist equipment that goes beyond what police forces have.
I'd say his reputation remains intact.
Meanwhile we have a police officer from Lancashire Constabulary who can't get their story straight, police divers who didn't search upstream from the bench, and who are still working on the sole assumption that she went into the water.