I have the non digital speedometer in my 2024 reg. SE L, it does not show a 30mph position and as 30mph is about 48.280kph

it is just a tad difficult to estimate the needle position when driving. Is this legal? could I use it as a defence?.

All speedometers in UK have a statutory requirement to overread - you will be perfectly OK to use the 50 KPH mark on the dial.

If that is really worrying you there's the speed limiter that is fitted as standard. There's little likelihood of trouble if you drive carefully so I think you can relax.

You should also be able to select the digital speedo to come up in your driver display alongside the analogue one.

A basic 'rule' for the speedometer of cars marketed in Europe is that the speedometer must be able to display the vehicle's speed in kilometres-per-hour KM/H). For European countries that use a different 'distance' system (ie. the UK's use of imperial units) it is permissible for the speedometer to display speed using those units, but the KM/H rule still applies. That's why traditional UK non-digital speedometers have a MPH scale and a KM/H scale, normally with the MPH scale predominating. 

 

Regarding a UK speedometer's 'markings', the requirement is that it must be marked up to the maximum speed of the vehicle, with graduations at 1, 2, 5, or 10mph, and with values at intervals not exceeding 20mph and my Fabia Mk4's non-digital speedometer happens to have the same 20-MPH interval markings as my 2009 Skoda Roomster's. 

 

There's no doubt that my Fabia's and Roomster's speedometers are fully legal UK-markings-wise (though the Roomster's speedometer is virtually unreadable in daylight).

 

Fortunately, the Fabia's speedometer is properly illuminated and - as offthewall has advised - speed can also be displayed as a digital value centrally between the rev-counter and speedometer dials using the controls on the right-hand spoke of the steering-wheel. (This is just an example, not a current-model Fabia Mk 4's speedometer.)