DVSA confirm the contract for the sat nav to be used by examiners on test.

The TomTom Start52 device will be used for the new practical test

From 4th December 2017 the sat nav to be used by examiners will be the TomTom Start52.

The DVSA is keen to say that this should not be seen as an official or approved choice it is simply the one they have decided to use following the usual government procurement procedure.
The emphasis of training for the new practical test starting from December 4th should not be on using any particular brand of satnav device. It is suitable to teach pupils to use any brand. Using the satnav is simply to allow a longer and more realistic period of independent driving whilst training new drivers to cope with the distraction of such a device.
1 in 5 tests will not use a sat nav but will follow signs or road markings.