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Thanks for the advice. With blue being the new neutral colour I can see the need to stop using it for live. Glad that you are not saying it has to be brown tails. Yet ! You seems to be saying that it will be OK to connect red tails onto the service head fuse (which has a blue spot on it)...

A 3 phase supply comes into our community hall - previously used for storage heaters. Electricity board supply head is colour-coded R, Y, B. The red and yellow phases are no longer connected to anything. The blue phase has a service fuse from which a blue tail goes to the meter and thence...