Template:M summ Equity Derivatives 6.3(c)

See Market Disruption Event, for which this Exchange Disruption provision is relevant.

Where your trade is an Index Transaction, or an Index Basket Transaction, the disruption relates to transactions in the underlying Shares - because the Index doesn't exist per se as an investable stock.

There are, however, separate disruption events relating to change, cancellation or non-publication of Indices.