Despite Thames Water's claim to be replacing so much of our water mains, it
is very noticeable that major road works generally involve GAS main
repair/replacement.

I can't help thinking that if Transco adopted the same approach as Thames
Water to waiting for things to go bang before you mend them, London would be
a very dangerous place to live! And if Transco can (usually) stop leaks
before they happen, why can't Thames Water?

MaxB