Interference won't be as problematic as induced current by the 220v line. We're taught not to run network cable parallel to power cables due to this. Running networking in close proximity to higher frequency generating equipment can interfere, such as fluorescent lighting, etc.
Your TV cable should not interfere, either. At least here in the states there are very strict "leakage" restrictions. So long as your cable is in good condition, it should be fine.
Most cases of interference are negligible, anyway. Ethernet has mechanisms to overcome simple problems.
