When do Periodic Inspections have to be carried out?

Periodic inspection of a buildings electrical installation to BS 7671: Requirements for Electrical Installations (IET Wiring Regulations) is recommended:

for tenanted properties, every 5 years or at each change of occupancy – whichever is sooner
at least every 10 years for an owner-occupied home
at least every 5 years for a business
The Landlords and Tenant Act 1985 requires landlords of properties with short leases to keep the electrical wiring in repair and in proper working order.

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When do Periodic Inspections have to be carried out?