It may just be a toy, but if you invested in Lego rather than shares or gold for the last 15 years, you would be better off.

An analysis by the Telegraph has shown that the value of the FTSE 100 is no higher than in February 2000, meaning an average annual return of 4.1 per cent to savers.

Those who invested in hold received 9.6 per cent annual return since 2000, whereas those with an Isa made 2.8 per cent a year.

Meanwhile, the value of mint condition Lego sets has increased by 12 per cent every year.

The most expensive Lego set at the present is the Star Wars Ultimate Collector's Millennium Falcon, which is worth £2,712 today, up from £342.49 in 2007.

Sadly, the rule only seems to apply to sets which were produced after the turn of the century, which were a little more complex and expensive upon release.

So that race car your dad has kept hold of for 30 years, probably isn't worth that much.