Seeking experiences from UK users

Can I pick the brains of any UK installers. A few queries

1. UK power is usually via a fused spur as opposed to a 'plug in transformer' in these instances, what is a good source of DC power
2. Do users simply ignore the tamper wires for PIRs/motion sensors?
3. Any tips on connecting the siren? I'm guessing it works in the same manner as the US system/standards (with a DC signal tripping a relay), but I would welcome any insights in case there are differences

Finally, is there any other advice that someone with UK installation experience would like to share to someone considering a conversion from an old UK wired panel.
Many thanks, A

Hi did you manage to get this installed in the UK, and how easy was it?