By James DaveyLONDON (Reuters) - British consumer group Which? has urged the government to take action to support households when the competition watchdog publishes its review of grocery pricing, saying some food prices have jumped by as much as 175% since 2021. "The hard work being done by retailers to absorb cost increases means the UK offers among the cheapest grocery prices in Europe," said BRC Chief Executive Helen Dickinson. While the UK government has raised concerns about soaring food prices it has said it was not considering imposing price caps