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EAWR.I don't think there is a regulation, but good practice, any cores not earthed can pick up voltage due to capacitive and inductive linking, but it would depend on cable lenght.
See section 8
The Electricity at Work Regulations 1989
These Regulations impose health and safety requirements with respect to electricity at work.
www.legislation.gov.uk
I always terminate them and if they are an unused conductor then they are identified as such at both ends, earthed at the supply end.