My proposed central heating system comprises a boiler, four pumps, two
zone valves, three mixing valves and two controllers.

What's the best way to provide mains power to this lot? I was planning
to install a single "heating system" radial circuit using 4mm=B2 twin
and earth. This circuit would start at the consumer unit and snake its
way through the house from component to component before being
terminated at the boiler. Each component would have its own local fused
connection unit to isolate it electrically.

Does that solution seem OK? Any tips?