From 1 July 2006 newly introduced models of a vehicle available on the market must comply with ADR 18/03. Also, from 1 July 2007 any newly manufactured vehicle (excluding mopeds) must comply with this rule.
This new rule requires that the speedo must not indicate a speed less than the vehicle’s true speed or a speed greater than the vehicle’s true speed by an amount more than 10 percent plus 4 km/h. Significantly, this change means that speedos must always read 'safe', meaning that the vehicle's true speed must not be higher than the speed indicated by the speedo.
That is, at a true vehicle speed of 100km/h the speedo must read between 100km/h and 114km/h. An alternative way to look at it is; at an indicated speed of 100km/h, the vehicle's true speed must be between 86 km/h and 100km/h.
I hope this clarifies things, and that you don't get a ticket (as you wrote you were slowing down)
Since my car is made in the UK, i do not know if they use specialized parts during manufacturing of it but under UK law it is 10%+4km/h
"The Road Vehicles (Construction and Use) Regulations 1986, as amended, allows the use of speedometers that meet the requirements of EC Community Directive 75/443(97/39) or ECE Regulations 39. Both the EC Directive and the ECE Regulation lay down accuracy requirements to be applied at the time of vehicle approval for speedometers. These requirements are that the indicated speed must not be more than 10 per cent of the true speed plus 4km/h (2.5 mph)." "In production, however, a slightly different tolerance of 5 per cent plus 10 km/h (6 mph) is applied" "The requirements are also that the indicated speed must never be less than the true speed. A vehicle meeting these requirements would not be able to travel at a greater speed than that shown on the speedometer and a driver could not, therefore, inadvertently exceed speed restrictions. Her Majesty's Government have no plans to introduce instrument tests"
Which seems to be the same as the australian one.
If i do get a ticket, ill appeal it.
I was slowing down and have a clean record.
Well no ticket yet
And i cant even check my demerits on the RTA site as my account is "locked" and i could not be bothered to call them and unlock it.
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