There are various options for studying Dutch in the UK:
For children (4-12 years old):
De Regenboogschool, London www.regenboogschool.org.uk
Richmond Dutch School, London www.richmonddutchschool.org.uk
De 7 Eiken, Sevenoaks, Kent www.7eiken.co.uk
De Droomtorens, Oxford www.dedroomtorens.org.uk
NTC De Luchtballon, Chester www.deluchtballon.co.uk
De Vaarboom, Cambridge www.devaarboom.co.uk
All ages, completly online:
www.d-teachschool.com (Dutch and other subjects)
Evening school, online:
Citylit: https://www.citylit.ac.uk/courses/languages/european/dutch
Higher Education:
University of Sheffield www.sheffield.ac.uk/dutch
The Dutch Language School www.dutchlanguageschool.co.uk
University College London https://www.ucl.ac.uk/languages-international-education/language-courses/online-dutch-courses
University of Westminster www.westminster.ac.uk/languages-short-courses/dutch
Manchester University www.languagecentre.manchester.ac.uk/learn-a-language/courses-for-all/dutch/
International schools with Dutch in their curriculum:
ACS Cobham www.acs-schools.com/cobham
ACS Egham www.acs-schools.com/acs-egham
ACS Hillingdon www.acs-schools.com/hillingdon
Southbank International School www.southbank.org
International School London www.isllondon.org
International School of Aberdeen www.isa.aberdeen.sch.uk
In addition to language courses, some universities provide a broader educational programme in Dutch and Low Countries studies that focuses on literature, culture and the history of the Low Countries.