Can't see Lucy's film? Watch it here.
There's £860 million lying unclaimed in "lost" or forgotten accounts in British banks and building societies.
Lucy Siegle told us what to do if you think you may have lost touch with your account or savings.
She recommended visiting mylostaccount.org.uk, a free service brought to you by the British Bankers' Association, the Building Societies Association and National Savings and Investments.
If you need to trace a lost account, you can make a claim online, by clicking here.
Or you can make a claim by post. Download the forms below:
Building society: Trace dormant accounts leaflet.
National Savings: Trace dormant savings leaflet.
Have you been reunited with money in a dormant account? Any hints and tips you can pass on?