As expected my application was refused.

whilst the HSMP application is being considered and without filing any FLR of any kind. The decision letter was dated 8 March 2005 but I just receive it today 22 March 2005. Would anybody in this forum know how long I could stay to lodge an appeal in country.
Another question I have was, I just receive an email today that I got a job offer from a company who is willing to sponsor me a work permit. Would I be able to switch to workpermit under this conditions since my leave to Remain has expired. Do I have to go back to my home country
to start on a clean slate again. Any advise would be highly appreciated