"Installing or upgrading of supplementary or Main equipotential bonding does not need notifying to the local building control officer." (Quote from paul Cook).
You can't upgrade supplementary bonding in a special location e.g. bathroom without notifying BC.
"DESCRIPTIONS OF WORK WHERE NO BUILDING NOTICE OR DEPOSIT OF FULL PLANS REQUIRED
...
2. Work which -
(a) is not in a kitchen, or a special location,
(b) does not involve work on a special installation, and
(c) consists of -
(i) adding light fittings and switches to an existing circuit;
(ii) adding socket outlets and fused spurs to an existing ring or radial circuit; or (iii) installing or upgrading main or supplementary equipotential bonding."
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