Hannah Callen, a full-time freelance writer-editor, consultant and columnist in Hertfordshire, is keen to help consumers make informed monetary and credit decisions. Hannah once fell foul of easy credit but has since successfully overcome her difficulties and gained an immense amount of knowledge along the way, which she now shares online.

Hannah Callen explores the credit card industry's nickname 'card tarts' and explains how customers who transfer balances from one deal to the next can save money.