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The idea is that you use the availability checker of your intended ISP, which will check for the availability of all necessary infrastructure. Most ISPs use BT Wholesale - it's only a handful that don't, though the two main exceptions, Sky and TalkTalk, are two of the largest ISPs.
The BT Wholesale checker is there as a service to the wider community. If it highlighted customer ISPs, that could be seen as BT Group favouring BT Wholesale based ISPs over non-BT Wholesale ISPs who take services directly from Openreach, which could give rise to regulatory issues. It is possible for an company using BT Wholesale WBC only to cover a limited geographic area, depending on which BT Wholesale nodes they choose to connect to, though this is more likely to apply to companies contracting directly with BT Wholesale to provide home service to their employees in a limited geographic area than an ISP serving the general public.
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