Hi Stank,
The current fee for starting a claim is £80 on my last visit, could have increased. However, when you win the case, you not only get that back but also your incurred expenses. It's up to you what you want to do. You mention that you placed the cable in a channel, you also failed to mention that you informed the carpet fitters of the location of each and every cable relevant to your post. Which you did, O.K. ? someone prove otherwise.
If you installed the system yourself, I need to know so that we can go from there. If it is indeed a C&K 800L, and Sparkymarka is usually spot on when he suggests something, then we can go ahead and resolve the problem without paying out any more hard cash. You will need:- the correct fuses for the panel, a copy of the engineering manual (not always, but it's handy) two small plastic junction boxes (white or brown) a short length of alarm cable.... Or... you can join the coloured cores together with insulating tape (not really advisable). Let me know what you intend to do.
Take Care.
Take Care.