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Updated:Apr 23, 2026
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Construction and opening of London's Ringways and the M25 (1966–1986)

Construction and opening of London's Ringways and the M25 (1966–1986)

  1. GLC begins detailed London Ringways planning

    Labels: Greater London, Ringways plan
  2. GLDP public inquiry opens over Ringways plan

    Labels: GLDP public, Greater London
  3. GLDP inquiry hearings conclude

    Labels: GLDP inquiry, Greater London
  4. Layfield report delivered on GLDP objections

    Labels: Layfield report, Frank Layfield
  5. Outer-ring construction begins that becomes M25

    Labels: Outer ring, M25 precursor
  6. Government statement responds to GLDP inquiry

    Labels: Government statement, Parliament
  7. M25 route consolidated from Ringways 3 and 4

    Labels: M25, Ringways consolidation
  8. First M25-related section opens (South Mimms–Potters Bar)

    Labels: South Mimms, M25 section