In 2009 the usually cerebral James Murdoch launched a scathing attack on the BBC, whose size and zeal for expansion into new areas he described as "chilling".

They lose all the zeal to learn new things and although they won't admit this, their actions would make you believe they have thrown in the towel and are satisfied with a status quo life and career.

While that may be true, the new zeal in enforcing the rules seems an odd use of park police.