The SNP suspends Margaret Ferrier after she admits taking the return train journey to Westminster.
There will also be tougher fines of up to £10,000 for those who fail to self-isolate as required.
Stricter measures will be introduced in Liverpool, Warrington, Hartlepool and Middlesbrough.
Duke and duchess say there have been changes but "sufficient progress" has not been made.
Ministers are considering converting disused ferries to process people seeking asylum in the UK.