You are correct in that legislation came into force in 2018 that all new cars should have an SOS button, but an important distinction is that the term 'new cars' refers to newly-launched models. We have seen other reports that Grandland owners have raised this issue with dealers and the DVSA, and have been told that because the Grandland is effectively a facelift of the Grandland X which was introduced before the April 2018 deadline it is not legally required to have one.