Studying in the UK once Brexit dust settles

While everyone knows that Brexit is due to come into effect this year, nobody knows exactly what form it will take.
More than 500,000 foreign students study in the UK every year, and so the authorities in Scotland, England, Wales and Northern Ireland have moved to assure students starting their college courses this year, 2019/2020 and next year, 2020/2021, that the current fees and financial assistance packages available to them remain unchanged for the duration of their college course.