Please click the following links:
https://www.civilservicepensionscheme.org.uk/memberhub/knowledge-centre/tools-and-calcs/pension-calculators/
https://departmentfortransportuk.sharepoint.com/sites/intranet-me-at-dft/SitePages/your-pension.aspx?web=1
If any links do not work, please contact HRadvice@dft.gov.uk