Why wages fell and profits surged in the EU

Exactly

What - like when Ford got an EU grant to move production out of the UK you mean?

Companies pay for experience and talent.
They entice the best applicants by offering better terms and conditions.
Not worse.
Brexit offered a high wage high skilled economy.
You are touting a poorly skiled low wage economy. IOW a third world economy.

Companies hire based on the projected rise in productivity they can offer the company.
Not how many applicants are available.
You are assuming that every potential applicant is identical. A terracotta army.
The reality is that every applicant offers something different.
And finally it is a common custom that if an applicant is offered a job, there is negotiation about the final terms of remuneration.
Do I get a car? Shares in the company? Bonuses? An off shore account? Paid holiday? These could be a large percentage of a wage...I mean who wants to earn a high public wage when some of it can be paid in non taxable remuneration?

Your very simple idea of supply and demand of labour determines wages is over 100 years old and I believe is a Marxist argument describing a reason for static class position.

The way out is social fluidity through education and the opportunity to gain experience from a wide choice of offers.
IOW freedom of movement in a level playing field.

Economics can be ultra complex - but the basic framework of economics is straight forward.

A ready supply of labour can push down wages, but only to a degree, and only in certain sectors, mostly in unskilled jobs which pay the Minimum Wage ... you cannot drive down wages below the minimum wage. But I accept that a labour shortage CAN push up wages, as is happening in some areas now.

But the other and MORE IMPORTANT thing that a ready supply of labour does, is that it (A) allows existing business to grow and expand, and (B) creates the conditions for new businesses and new industries.

Shortages of unskilled labour in productive industry can force employers to increase wages, thereby increasing costs, often making products uncompetetive.

Europe still has Freedom Of Movement, and labour shortages are not as severe as here, and as a result UK growth is been affected, and some sectors in the food and agricultural industry have an uncertain future because of Brexit.

Our Salad Industry which flourished and grew because of European workers now has an uncertain future, and other producers and growers in the food industry are going to have growth and expansion plans put into question or put back.

Of course another basic of economics is that if YOUR workers get £15 per hour, and your competitor in Holland is paying £11, you lose out, you lose out to your Dutch competitor, and Aldi will sell Dutch Tomatoes NOT British ones.

Not at all - I want businesses to move on from the low pay, low skill economy that 4 decades of EU membership gave us. Instead of just importing another batch of cheap foreign labour I want them to start investing in technology and training for the British worker.

Yet another post that hasn't a clue about migrant labour arriving under FOM.

From the mid 1990s until the Credit Crisis and recession we had a long period of sustained growth, and though we had access to European labour, unemployment levels were low, jobs were readily available.

Industries that are now suffering the worst because of labour shortages are Hospitality, Catering, the Care sector, Food Production.

These sectors MOSTLY or MAINLY pay the National Minimum Wage, therefore to suggest that European workers pushed down wages is blatantly not true.

As per my previous post - put up your wages to attract people = higher production costs = you give your European competitor the edge = the supermarket sells the European produce = job losses