If you loved Nicola Walker’s performance in ITV crime drama Unforgotten as much as we did, we have a feeling you’ll want to know about a lesser-known series that might just knock it off its pedestal.

Collateral is a valuable asset (like a car, house or even cash) you can pledge to secure a loan. If you fail to repay your loan, the lender can seize whatever you've put up as collateral. Financial ...