I knew about the exception also but I always think its a bit strange. Wikipedia refers to it as more of a tax on performances than perpetual copyright[1] because European copyrights for Peter Pan expired on December 31 2007.
The legislation is 301 Provisions for the benefit of the Hospital for Sick Children from the Copyright, Designs and Patents Act 1988[2]
The legislation is 301 Provisions for the benefit of the Hospital for Sick Children from the Copyright, Designs and Patents Act 1988[2]
[1] http://en.wikipedia.org/wiki/Perpetual_copyright [2] http://www.legislation.gov.uk/ukpga/1988/48?view=plain