The cold water tap that could scald

I reported a problem several times with our cold water, when you turned the cold water on it ran hot, very hot. Hot enough to scald.
 
The heating engineers came out several times and struggled to not only understand why it was happening but more importantly how to fix it. The video below shows the tap in the cold water position. Every cold water tap in the house had the same problem.

Next Page – The neighbour issues