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Evohome with Heatpump - Shortcycling Inefficiency due to limited boiler settings.
We're S-Plan as well however I have 3x BDR91 - hot water and heating zone valve relays and a boiler relay, so I do get the cycle time adjustments. (As well as hot water overrun)
That's why I mentioned traditional wiring!
having the extra BDR91 makes a lot of sense. And also protects you from broken microswitches in the zone valves, which seems to be a regular thing.
Wired directly to the boiler (instead of using feeds via the zone valves). And configured as boiler control on the controller. Normally with S Plan there's no boiler control (lots of people mistakenly add it, causing all kinds of problems).
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