{{#media.focal_point}}. There will be a new announcer on Saturday against Everton. If ever you hear "Mr Brian Moon" that is a … Now someone has revealed that Mr Moon was the lead fireman at the Boleyn Ground after world war two. West Ham United fans finally have a long awaited answer to one of Upton Park’s greatest mysteries… just who is ‘Mr Moon’. {{#media.focal_point}}, {{#media.media_details}} This is an interview I did with West Ham's stadium announcer Jeremy Nicholas about his book 'Mr Moon Has Left The Stadium', which had just been released. While some ‘in the know’ supporters may already be wise as to exactly who, or rather what, Mr Moon really is, for thousands of West Ham fans it has been a mystery stretching back decades. The announcements are always greeted with cheers when Mr Moon arrives and boos when he leaves, from the Upton Park faithful. Mr Moon Has Left the Stadium By Jeremy Nicholas. Everyday low prices and free delivery on eligible orders. The next question is, will he be moving to the Olympic Stadium as well next summer? Mr Moon means there is a fire alarm gone off somewhere (normally someone smoking in boxes/corporate toilets). Now someone has revealed that Mr Moon was the lead fireman at the Boleyn Ground after world war two. And it appears the mysterious Mr Moon isn’t a Mr at all, it is in fact a signal to club staff when one of the fire alarms has been set off. 'I suffered a lot' - Tevez opens up on West Ham trauma after 2006 arrival, 'Surprised me': West Ham fans react to Felipe Anderson's comments, 'Noooooooo, absolute sickener': Everton fans gutted by 'nightmare' update on £18m man, {{#media.media_details}} So there you have it, word from (near) the top on Mr Moon. It is no secret that the coded messaged means the stadium fire alarm has been activated, often around half time as fans have a crafty cigarette in the toilets. Thanks for having me for the past sixteen seasons. We have match day fire stewards and they have to check it. Responding to a fan asking who Mr Moon was on Twitter, Sullivan said: “If a fire alarm goes off, one in one of the kitchens that goes off always, therefore the firefighters come (Mr Moon).”, If a fire alarm goes off, one in one of the kitchens that goes off always Therefore the firefighters come (mr moon) https://t.co/c5j1aiOxrI, — Jack Sullivan (@jsullivanwhu) November 11, 2015. @WestHam_Central ok pic.twitter.com/TuLMjpAWb4, — Jack Sullivan (@jsullivanwhu) October 14, 2015. Over many years we have heard many stadium announcements about the famous Mr Moon at the Boleyn Ground. The announcements have become so iconic they even made it into one of EA Sports’ FIFA football computer games. I will be West Ham Till I Die. The interview was originally published on my previous website 'HammerTime' in September 2011, but seeing as many you of may not have seen it and that it's still an interesting interview, I thought I'd bring it back to life on this website. Have something to tell us about this article? West Ham United fans finally have a long awaited answer to one of Upton Park’s greatest mysteries… just who is ‘Mr Moon’. Messaging Jack Sullivan on twitter the former West Ham employee “I was told (when I worked there in the late 80’s) that Mr Moon was the lead fireman that looked after the ground after the war”, I wonder if Mr Moon has a Twitter account…, Irons refuse to give City defender assurances, Villa v Irons – Everything you need to know, Hammers planning for 16.5k fans to return. When he was sacked after ten years in the job at West Ham, he felt like he d been chucked by a girlfriend he d loved all his life. This is an insider s view of a club that s never far from the headlines, despite not buying any silver polish since 1980. When the all clear is given we hear the famous message “Staff Announcement: Mr Moon has now left the stadium” often followed by a cheer from the crowd. Messaging Jack Sullivan on twitter the former West Ham employee “ I was told (when I worked there in the late 80’s) that Mr Moon was the lead fireman that looked after the ground after the war” Hammers fans are used to hearing announcements belted out over the club’s sound system at home games exclaiming ‘Mr Moon is in the building’ and ‘Mr Moon has left the building’. Well the question has now been put to bed by none other than Jack Sullivan, the teenage son of the East Londoners’ co-owner David. In other news, 'Noooooooo, absolute sickener': Everton fans gutted by 'nightmare' update on £18m man. When you hear Mr Moon has left the building; means that all is ok. When a fire alarm is activated at the Boleyn Ground, the standard message often heard : “Will the Club secretary please note Mr Moon is in the Stadium”. I’m sad that I didn’t get a chance to say goodbye over the PA at a game, but Mr Moon has left the Stadium. West Ham owner's £1m loan to crime boss Multi-millionaire Hammers chief David Sullivan has been linked to a man accused of leading a gang involved in fraud, money-laundering and 'extreme violence' Buy Mr Moon Has Left the Stadium: Confessions of a Matchday Announcer by Jeremy Nicholas (ISBN: 9781849541299) from Amazon's Book Store. That’s not to say West Ham fans should suddenly start rushing for the exits fearing for their lives when they hear it from now on. Sullivan has reassured supporters it is an alarm which always goes off. It’s the club’s biggest in-joke, except very few know the punchline.