I think you will be referred back to the Job Centre and be expected to sign on and continue to search for jobs. You will now have the benefit of all that knowledge and experience from the programme (?!), and employers get some costs paid if they employ you from the work programme so in theory you stand a better chance of getting a job.
I would like to say that I was signing on at the Job Centre for a period and although I agree it is not always constructive, it did give me an incentive to continue to search through a variety of sources (newspapers, internet, visiting employers) to get back into employment, and made me reassess my criteria. In the end I applied for jobs which were further away than I had initially considered, and got a job which I enjoy.