Resolution. Resolves YES if the first published version of the House of Commons Library research briefing titled 'Autumn Budget 2026: Reaction' contains the word 'PolicyEngine'. If no briefing carries that title, the Library briefing that summarises external organisations' responses to the Budget governs. The creator will close this market when the briefing is published; it closes automatically at 23:59 UTC on 7 November 2026 if that has not happened. N/A if no such briefing is published by 31 December 2026. PolicyEngine will contact the Commons Library as part of its Budget outreach; the 2025 briefing (CBP-10407) listed ten think tanks and PolicyEngine was absent.

PolicyEngine controls or influences whether this market resolves YES. PolicyEngine staff and contractors do not trade in this market.

If the Budget moves to another date in 2026, this market follows it and the close time moves with it. If no Budget is delivered by 31 December 2026, resolves N/A. Created by Max Ghenis of PolicyEngine (https://www.policyengine.org/uk) as a public record of what PolicyEngine expected before the Budget.

Clarification, 11 October 2026. The first published version means the version live on the day the briefing first appears, as shown by a same-day capture (any trader or the creator may make one), or else the earliest capture. A mention of PolicyEngine in the visible text counts, in any letter case and including 'Policy Engine' with a space. A hyperlink to policyengine.org without the name does not count.