There are several different look-alike cables around. There are different impedances for different applications. If there is a mismatch in the system owing to using the incorrect cable, the signal strength will be vastly reduced by the time it gets to the TV box.
If you stick with Labgear satellite cables, you should be alright. Screwfix offer a range of Labgear cables which are suitable.
Their part numbers are: 35148 Labgear RG6 Satellite coaxial cable. Copper clad steel conductor, copper screen. 25m reel £7.92