The average stocks and shares Isa fell by 13.3% during the 2019/20 tax year.

Biotechnology & Healthcare was the top performing investment company sector over the past decade, according to data from the Association of Investment Companies.

Technology funds bounced back to lead global markets over the past decade but energy funds fared badly with funds in this sector forming half of the top 10 worst performers, according to analysis by Willis Owen.

A Japanese fund - Legg Mason Japan Equity - has topped the best performing funds over the past decade but the best performers were a mixed bag with no single sector dominating.