Replacing alarm with a hybrid

[Snowyy]

Hi
I've got a broken Guardtec 370 house alarm (or so I have been told on here in one of my previous posts). I was thinking about ripping it all out and replacing it with a wireless system but I've seen the light and now want to have a wired system. Am I right in thinking that once I disconnect the old one I can use the wire from the spur to power it and use the existing wire from the bell box for the new bell box. Are there any wired systems out there has can have wireless PIR's? I was thinking of having the bell box wired (if I can use the existing wire) and then adding wireless PIR to save routing cables all around the house. At the moment there are only 2 wired PIR's, I would require another one in the lounge, 1 in the kitchen, 1 in the hall and putting 1 or 2 in my garage which is about 12mtr away from the current alarm box. I was going to get a separate alarm for the garage but thought if I get a decent smart alarm system then I can spend £30 for the PIR for the garage saving me £100'S on the separate alarm. Any recommendations from past experience

 

[sparkymarka]

Texecom ricochet / scantronic /pyronix enforcer plenty out there.

 

[Snowyy]

also the power supply comes directly from the consumer unit, it goes out of the consumer unit, outside and down the wall, into the hall closet and straight into the alarm. I'm no electrician but shouldn't it go into a FCU?

 

[EightyTwo]

If the cable comes from its own MCB of a suitable rating (5A), it should be fine but a little inconvenient.

 

[seasickstevie]

... MCB of a suitable rating (5A) ...

Or more likely 6amp

 

[EightyTwo]

Or more likely 6amp

Yeah, sorry!