Ideally the government would not charge, but testing would be mandatory, no ifs, no buts, no excuses, no exceptions. However watching "Hancock's Half Hour" this morning, and reading between the lines, I don't actually believe there is sufficient lab capacity in the UK's "world beating" (not) testing system to accommodate all the tests. Germany has found this to be the case and is dropping the testing on arrival from what I read last week.