Having explained to gammons why student migration is a good thing for the UK, I will briefly explain why worker migration is also a good thing for the UK.
Although there are many unemployed (in the UK), loads of employers are unable to get the workers they need - either because the unemployed to not have the requisite skills to do the job, or are unwilling to undertake the work. The government’s response to this is to tell employers to train the workers they need, as if this could be achieved in a day or so, at minimal cost. If employers could employ migrant workers, there would be no/minimal training required and they could fill job vacancies otherwise left un-filled. The migrant workers would be paying tax and contributing to the economy through the money they earned and spend, benefitting the UK. This is the reason we need more migrant workers.
Of course, many of the migrant workers would not have the correct colour skin – much to the annoyance of the racist gammons.