A friend of mine needs answer to a question (she has no internet) they have lived here a few years, have residencia and always driven on a UK license. They never had theirs inscripted or anything.
They now plan to buy a car in the UK but also keep their car here (OK for some) so they can travel back and forth spending a few months in each country. Not sure if they own house in UK but will be renting in Tenerife.
Now, even though they have never bothered before
for some reason she wants to know if they need to do anything with licenses. Or are they are OK leaving things as they are and if stopped just tell police they live here some of time and in UK the rest of the time.