In March 2003 the BBC announced that from the end of May 2003 (subsequently deferred to 14 July) it intended to transmit all eight of its domestic television channels (including the 15 regional variations of BBC 1) unencrypted from the Astra 2D satellite. This move was estimated to save the BBC £85 million over the next five years.

Answer this question, if possible (if impossible, reply "unanswerable"): How much money was the move estimated to save over the next 15 years?
unanswerable