To Hide or Not To Hide (Cable That is)

[Mr-Pickles 0]

So Chaps, I would like to know if when installing CCTV on a House, do you;

 

1. Always Hide Cable No Matter What, (such as running it in the wall cavity)?

 

2. Run Cable Externally?

 

3. Either Depending on the Price of the Job?

 

4. Hide Cable if poss, but if not externally?

 

Also, if running in the cavity of the wall, what are your best tips or hacks that you've discovered

 

Thanks in Advance