Well I dont know much about the labour law but my hubby started at his new company a few days before the 1 year anniversary of the company that he resigned from, if that makes sence?

He does not need to cancel his visa as even without a job, that will enable him to stay here. Without that he has to go! Although he has been told 1 month, he should have untill his visa expires.

The new company have been great and have sorted out the change of sponsership and visa.

So it is possible, I would say, to change companies within the first year.