No, the consent is purely so that the rights of the lenders are not compromised by someone who had a prior interest in the premises. Comes from a case back in the 1980s involving a banks which could not throw a wife out of the house when the husband did not pay the mortgage. So they got existing people, who were not owners but lived there, to sign away their rights before they lent money. It only applies to when loans are requested and granted, not houses where there are no loans. There are other laws which affect that.