What is a Flash Mob? A flash mob (or flashmob ) is a large group of people who assemble suddenly in a public place (usually organised online), perform an unusual action for a brief time then disperse or continue on their way as if nothing happened. So What is the UK Big Freeze? The UK Big Freeze was a UK first with the aim of a Freeze flashmob taking place in 25 cities UK wide at the same time. The idea itself was to have people who appeared to be just general members of the public suddenly freeze into positions (all at the same time all around the UK) and hold them for 5 minutes before simple walking on. This year we are looking to do something even better but we are giving YOU the chance to decide what takes place. Let us hear your ideas by submitting them in our Big Idea Box. Who's behind the UK Big Freeze? The UK Big Freeze was conceved and organised by Josh Forwood. Each location of the UKBF1 also had a host who assisted in promoting the event and setting off the signals on the day. The website was designed and created by Josh Forwood and Chris Goddard.