So here's what we did;
1) We specified a separate return duct so all the outside lights and plug sockets go out of the building under the slab, then get routed behind the exterior cladding in the service cavity.
2) We have a specific duct in for the data and CCTV camera wires
3) We have two outside taps, one is teed off before the water pipe enters the house but the other one we ended up drilling through the house from the kitchen as it made sense given the location. We did all the airtightness taping etc and insulated the pipe.
You don't want to mix data and power cables in the same duct so map out what you want coming in and out, and go from there. MBC didn't charge us extra for the additional conduits we wanted but we did supply the pipe.