The first thing is not to conflate immigration with asylum. There is no such thing as illegally seeking asylum, but not seeking asylum upon arrival or remaining after an asylum application is rejected and all channels of appeal are exhausted would constitute illegal immigration.

What is a grave concern is if routes to asylum are closed off then this would just result in an increase in undocumented arrivals who would fall prey to people smugglers, modern slavery, sexual exploitation or organised crime.

another thing to bear in mind is calling immigration problematic is rhetoric. If anything our economy benefits from this and it enriches our society. The issues which government needs to get to grips with are housing/planning policy, particularly related to suburban and rural communities which puts pressure on inner cities, and economic development strategies that, for example, centralise financial services establishments, putting pressure on housing and transport infrastructure where the labour force is needed most. How many social housing estates are there in places like Henley or Chalfont?