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Hindsight is a wonderful thing, but it's a good rule never to task BT (or most other companies come to that) with two changes at once. A couple of years ago I made the mistake of ordering a service upgrade, then another before the first one had gone through. You would not believe the mess that ensued, taking 6 months to resolve even with the help of a senior BT executive, and a spurious bill for over 500 quid on the way!