The charge is mentioned on this page below and it is also mentioned when you ring 1471 but you have to listen to the whole message in order to hear it.
http://shop.virginmedia.com/phone/calling-features.html
Quote:
A charge sometimes applies1
Last Number Recall (1471)
Lets you know the last number that called you and allows you return the call.
Calling 1471 is free, but if you choose to return the call you will be charged 16.34p, in addition to your call charges.
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Quote:
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Calling 1471 is free, but if you choose to return the call (that's Option 3) you will be charged 16.34p, in addition to your call charges - please listen to the announcement carefully.
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