Where -
(a) a set or subset of exposures referred to in Regulation 123E is subject to one or more systemic risk buffers, and
(b) the setting or resetting of a systemic risk buffer rate or rates by the Bank would result in a combined systemic risk buffer rate greater than 5 per cent for any of those exposures,
the Bank shall seek the authorisation of the European Commission before implementing the systemic risk buffer.