LED headlight upgrades on classic cars: legal or not?

Classic cars built before 1 April 1986 can now have LED and high-intensity discharge bulbs

LED headlight upgrades on classic cars: legal or not?

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It is illegal to upgrade my headlights to LED?

7 Headlight Upgrade - DRL Style for Classic Ford - RHD – Powerful UK

Are LED headlight bulbs for cars legal?

Installing LED Lights in a Classic Car

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Are LED Headlights Legal?

BA15D LED Headlight Upgrade 6, 12 and 24 Volt Negative or Positive