Mancrick101

This has been a partially disconnected system in my property for the whole 7 years we’ve been here. We were burgled 2 weeks ago for my car keys (and car) and I’m looking to possibly reuse the existing wiring from this old system, which looks all ok. I’m ok wiring the mains to the panel / transformer and the battery, but am unsure where to wire the bell box and PIR sensors. I can’t find a manual as the make is unknown. Below is a picture if anybody can identify? Thanks Panel Board