Mate i did a ctts course,
The problem with this is that Fibre is not being rolled out just yet, where as most of the world has it. All the cat 5/6 cable will get dug out its just a case of when, once we have fibre then the possibilites are endless for example South Korea has broadband speeds up to 1000mbs, which puts Virgin to shame.
Most of the lads ended up with BT, or Virgin. I my self did a few installation contracts, the money is good but jobs round the North West area are few and far between.
If you can back up fibre/cable quals with some I.T quals, and the usually health and Safety it would work more in your favour.
I am a telecoms engineer at the moment but joining RN (AET) Telecoms is good to get into but you have to be at the cutting edge stuff VOIP SIP HOSTED SEATS etc etc PBX work ie cabling and all that good stuff is drying up If I was to start again now I would do Linux course then Network + and then CCNA this will give you a boost over others and get you the big bucks
anymore info pm me I will give you access to my ftp site and you can download course material