Primary: LegalHelp will customers. 22% of will clients buy LPA in the same engagement (IRN 2025, n=680). At 1,000 will customers, that's ~220 LPA purchases at ~£83 margin each = £18,260 additional margin at zero marginal CAC.
Secondary: DIY users who failed or are afraid of failing. 133,760 rejections in 2024. A product that credibly prevents rejection has a concrete, quantifiable value proposition: avoid losing £92 and starting again.
Not prioritised: the 70% solicitor route. Converting face-to-face LPA customers to digital requires significant trust infrastructure and Rob's active promotion. Possible longer-term but not the first market.
Size: if LegalHelp sells 5,000 wills/year, 22% attachment = ~1,100 LPA pairs/year at £83 each = ~£91,000 additional margin with no additional CAC spend. Not huge, but not trivial on top of the will margin.