Virgins triple screened coaxial cable is made specifically for them, as it has to prevent interference from entering the network & causing issues. Also extending cables can affect your signal level & hence the performance of your services.
The recommended option is to have a Virgin technician make the alterations & adjust the levels at the street cabinet. There is a standard charge of £99 for this work.
Making alterations yourself leaves you liable for any issues caused on the local network.
Cable customer since 1993. Services: FH TV, Sky Sports/Cinema (2xV6), Talk Anytime Phone, 350M BB, Virgin PAYG Mobile