Conversation so far:
is a marriage in canada legal in the uk
Your marriage will be recognised in the UK if you followed the correct procedures in the country where you got married and the marriage would be allowed under UK law.
is a marriage in the us legal in the UK
Your marriage will be recognised in the UK if you followed the correct procedures in the country where you got married and the marriage would be allowed under UK law.
is a marriage in india legal in the uk
Yes, marriage in India is legal in the UK as long as it has been a legal marriage in the country in which it took place.
is a marriage in taiwan legal in the uk
Yes, marriage in Taiwan is legal in the UK as long as it has been a legal marriage in the country in which it took place.

Question: how about Australia
Self-contained rewrite: is a marriage in australia legal in the uk