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"We would urge anyone thinking about taking part in a game or event like this to consider the significant safety and injury risks," police spokesperson Ross Grantham said in a statement on Tuesday.

Luke Melling, 31, from Melbourne, Australia, says he was "staring death in the face" before receiving a stem-cell transplant from Alastair Hawken, of Grantham, Lincolnshire.

The former Conservative prime minister was born in Grantham, Lincolnshire, in 1925 and died in April 2013, aged 87.

A council meeting earlier heard ideas being suggested for the festival, including themed beers with names such as Iron Lady or Grantham Lass, which would "relate to the Thatcher experience".

Karen Whitfield, assistant director of leisure, culture and place at the council, described the anniversary as a "significant event for Grantham".