Claim: Extending the Brexit transition period would cost an estimated 15 billion.
Fact-check: Would extending the Brexit transition period cost £15 billion? - Full Fact
Verdict: we can't know for sure—much will depend on the size of the eu's next budget and the sum would probably have to be negotiated. but £15 billion a year seems a reasonable estimate for now.
Organisation: Full Fact
Author: Joël Reland
Date published: 2018-11-07T00:00:00