Any provider of telecommunications services is obliged to comply with General Condition 17 as amended by Ofcom - see here
http://www.ofcom.org.uk/consult/condocs/numbering03/statement.
The requirement is summarised as follows.
Quote:call tariffs and call discounts will be the same as calls to geographic (01 or 02) numbers. This applies to all call minutes, including ones that are part of the customer’s inclusive minutes
Any breach of this requirement should be reported to Ofcom formally, although if the details are published here, relevant Ofcom personnel would be likely to informed directly.
Previous reports of similar cases have been resolved without the need for enforcement action, as they were found to be due to administrative failures.
There may be rogue providers of telephone services. I hope that attention will be directed at their roguery rather than at this website.
(N.B. this message was being prepared whilst posting #2 was made.)