Seems to be available now:

Source: http://news.ft.com/cms/s/801d37d6-36ce-11da-bedc-00000e2511c8.html

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From Prof Richard Green.

Sir, A company with an 0800 number loses money when it keeps people on hold, and would gain from Archie McKerrell's suggestion of telling people how long they had to wait (Letters October 4). Although this is likely to change soon, a company with an 0870 number has had a financial incentive to keep us hanging on as long as possible.

For example, British Airways received about 50p yesterday from my abortive attempt to contact them - a small sum individually, but they get a lot of calls . . .

Richard Green,
Department of Economics,
University of Birmingham,
Birmingham B15 2TT
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I had occasion to call BA recently to change a flight. I waited ages on their 0870 number and gave up. I then looked up the number given here on the website and got through immediately, I do mean immediately, withing 15 seconds I was speaking to a real person.

But Gazzer, Ofcom claim that there is no evidence that companies or government departments keep you queuing as long as possible on Disguised Premium numbers!

Surely you must be wrong? .............Uuuuuuuug