Wiring advice - Replacing Digistat SCR and Drayton LP522 with Hive

Hi all,

I'm replacing a Drayton Lp522 and Digistat SCR with a Hive v2. Initially thought it would be a question of disconnecting Digistat then using LP522 plate for Hive. Wiring is a bit unusual. 3 amp fused spur into Digistat, Digistat wired to LP522 then into LWC1 junction box. Please can anyone offer advice on wiring.

Conventional boiler with HW system. S plan.

Any advice much appreciated

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Digistat on left