Here are some links to useful websites and documents to use during the school closure when you are home schooling.
NRICH To develop problem solving skills in mathematics. For extra challenge, try some of these activities.
Khan AcademyEspecially good for maths and computing for all ages but other subjects at Secondary level. Note this uses the U.S. grade system but it's mostly common material.
Prodigy MathsIn U.S. grades, but good for UK Primary age.
Corbett MathsGreat instructional videos and worksheets for maths