I worked for a company which did this, but it was moving from midlands to south. Obviously houses, ( etc) were going to be much dearer. They offered relocation expenses ( quite generous, actually) but told those who refused to move that they were making themselves redundant. Of course a lot of families just couldn't move ( children/schools, aged parents, spouses' jobs, etc) so had to take the company's terms. However, the company did do one generous thing - for one month, the last month people were employed, they increased all salaries by 10 percent, so that people could quote a higher salary to a next employer.