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"Motorcycles first used on or after 1 August 1973 must emit a continuous or uniform sound that is not harsh or grating.
Motorcycles first used before 1 August 1973 can have a bulb horn as the audible warning."
( https://www.gov.uk/guidance/mot-inspection-manual-for-motorcycles/7-audible-warning )Having said that, most replica bulb horns will fail the " loud enough to be heard by other road users" requirement. I'd want something reassuringly loud if it came to a roadside conversation with law enforcement, though the pathetic electronic bleat from a Mobylette appears to be sufficient.
MrE
Pretty sure these are no longer accepted