Hi Rich., It is a requirement that all boilers tested by the Northern Fed. (The Southern now work to the same rules) have a unique number. The number consists of three parts, first a number identifying the club which the inspector is a member, then the Safe Working Pressure in psi then a unique number allocated by the boiler inspector. Cheers, Barrie -----Original Message----- From: R.L. Roebuck Sent: Wednesday, January 09, 2013 12:26 AM To: modeleng@xxxxxxxxxxxxx Subject: [modeleng] Boiler markings Dear All, I wonder if anyone could help out with a question regarding UK Southern Federation Club boiler markings: Am I right in thinking that all boilers tested need to have identifying markings now so that boiler certificates can be matched up to boilers, or is this not a requirement? If it s requirement, roughly how long has this been a requirement? I'm just trying to do a bit of 'detective' work in order to try to reunite a boiler with it's long lost boiler certification details, which has paid off a couple of times in the past, so thought I'd give it another go!!! All the best, Rich. MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line. MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.