(2)While the requirement for credit intermediaries in the mortgages sector to hold PII or comparable guarantee is a novel regulatory requirement at Union level, that requirement exists at national level in certain Member States. Indeed, those jurisdictions with experience in PII requirements exhibit the highest shares of intermediated mortgage sales across the Union, a history of significant market penetration by credit intermediaries and, consequently, also follow a more specific approach to regulating that sector. Therefore, Union rules on the minimum amount of PII or comparable guarantee should be based on the experience of those jurisdictions when it comes to determining the most suitable approach for calculating that minimum amount.