Shielded phone cable

Hi

Does anyone know where I can get a shielded phone cable?  

I recently changed to full fibre broadband and have noticed that the low frequency emissions from the phone cable are very high.  My system is on ethernet,  but this doesn't seem to reduce these emissions.

I've been told that I need a cable with RJ10/11 connections.  I live in the UK, so I need equipment that's compatible with UK phone systems.

Thanks very much

Cath