£36M is expected to be around limit to contest every seat in next GE… ‘Limits only apply to party spending during the 365 days before polling day – known as the ‘regulated period’.3 For the last general election on 4 July 2024, the regulated period began on 6 July 2023. Each party can spend £54,010 for each constituency that they contest. A party that chooses to contest all 632 seats in Great Britain at the election will therefore be able to spend just over £34m.’ https://www.instituteforgovernment.org.uk/explainer/election-spending-regulated-uk