Prices climb 10.1% in the year to July as the cost of food, household goods and holidays soars.
Police say the attack on Thomas O'Halloran, 87, in west London was an act of unprovoked violence.
The four militants were identified because of arrests years earlier at an English Defence League counter-protest.
A Met Office warning of storms and flash flooding for the South East continues for the next few hours.
Members of the Communication Workers Union at the Royal Mail voted to strike over terms and conditions.