The offer (missing the visa approval clause) had a start date of next week, now what?

This has become an ongoing situation they are all still trying to wade through.

The candidate finally did receive their offer signed by the head of the legal department. All clauses were included as requested and all inappropriate clauses were removed. The candidate has accepted, has given notice at work and in her residence. All that she needs now is the working visa which the company will be providing so she can start in the next month.