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Originally Posted by ianathuth
That all depends on what you mean by "critical national infrastructure". The answer for some traffic is covered by the OSA.
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Indeed. Both NTL and Telewest actually carry a significant amount of PSTN traffic (eg phone calls). If you ring one BT line from another BT line, your call may go through NTL/TW's equipment if BT's Exchanges are busy.
A lot of the truely 'critical' stuff, however, goes nowhere near NTL or TW. They wouldn't be touched with a barge poll (and rightly so).
Even 999 calls and management for NTL and TW is outsourced via Cable and Wireless.