On Saturday, 1 May 2021 at 15:26:58 UTC+1, newshound wrote:

There is a trade-off. How much money do you spend on sensors. How much
time and effort on direct and remote inspection.

As another poster pointed out, it is a developing problem with people
flushing so-called flushable wet wipes, etc. There are also more city
centre restaurants and take-aways, although I have the impression that
much more effort now goes into preventing fats from entering sewers from
these sources

Certainly, while people put wet wipes, etc., down, there will continue to be a problem.

But the costs of removal can be huge - just had a look around and saw one 10 tonner cost £400,000 to remove and fix. And costs in millions for others.

It simply cannot cost anything like that much to have a look every week with a camera. Though a fully automated system could cost a bit to install.