This complex project on the 160-year-old tower will involve the full scaffolding of the tower, repairs to the stonework which currently poses a health and safety risk, as well as all other fabric conservation works that can be meaningfully undertaken from a scaffold. Subject to further detailed analysis, it is expected to cost between £170–£250 million. A firm budget within this range will be released for approval in line with the Parliamentary Governance approval process in early 2024.