[Pierre]

Teesside, is the Virgin Media capital of copper theft, followed closely by certain areas of the capital.

In reality there is very little you can do about it. You can't lock all the chambers (although in certain areas in certain cities, this has been done)

It's not just copper, you get many would be theives cutting fibre, to check if it's copper - causes mayhem.

All you can do is get the police to visit scrap dealer and advise them not to take copper cabling from neferious types. If the scrap dealers don't buy it then no-one will nick it.