Why, for Labour, can Geographical Immobility occur? [People can't move due to the sake of Moving]

-Disparity in House Prices, Rent and Cost of Living - Cornwall vs South East England. Workers may not be able to Move -High Costs in just Moving Houses -Reluctant to Move due to Family, Friends and Change -Imperfect Information about Jobs available in Different Areas [They don't know if that's Advantageous]