Unless you've decided to run a BNC network or moca (possible if you were in the US - but then you wouldn't ask about Wilko), what has this got to do with the networking forum? Wilko don't make it, they buy it it from a third party at an agreed spec, i'd be surprised if it isn't shielded with foil/braid if you're buying it by the meter, the pre-made patch leads are just foil from memory, but like most things, they will buy different products from different suppliers at different points in time.