{UK can control who enters the UK. Mass immigration has wrecked the UK. Even the labour government who was in power between 1997 and 2010 have acknowledged that it was a mistake.}
So why is it the EU's 'fault' that the sovereign UK government can't manage immigration? Emergency powers are available and it could have been controlled at any time.
{UK can gain access to cheaper goods. Existing tariffs make; food, clothing and footwear more expensive for the least well off in the UK, but they represent a high % of the expenditure of those who are the least well off.}
Dropping tariffs will also kill off UK manufacturing as tariffs work both ways.
{UK will not have to pay EU membership fees. Can't see the benefit of putting money into a pot only for weaker Countries to take from the same pot. For example how would someone with a million pounds gain from opening a joint account with someone else who has one pound?}
The return on 'investment' of the UK payment is something like 6 or 8 times what is paid into the EU. It is realised as 'facilitation' (ability to trade tariff free with 70 countries being part of it) rather than 'cash'.
{EU represents about 17% of total world trade. So trade outside the EU represents 83%.}
This is far too simplistic. The UK can't ramp up manufacturing hugely as it does not have the resources, either raw materials or skilled workers.
{Is now a good time to point out that despite very high levels of immigration, the unemployment rate is extremely low and wages are risinG? }
Now would be a good time to point out that the way the government calculates 'employed' has been shifted so that someone working a handful of hours a week for minimum wage counts as employed. They obviously can't afford much beyond food, let along decent housing. If the high employment was for proper pay, then there would be no homelessness or need for food banks.