Both new products track the performance of the FTSE 100 Index over a six-year period, and between them offer investors different opportunities for returns, depending on their appetite for risk.

Barclays says the FTSE 100 Lock-in Note offers investors a potential annual return of 11.25 per cent, “locked-in” each year and paid at maturity, potentially returning a maximum of 67.25 per cent.

The Growthbuilder offers a potential 6.25 per cent return each year. Again, returns will be "locked-in" every year, and total returns paid at maturity. The Growthbuilder differs from the FTSE 100 Lock-in Note in that, after the six-year term, investors will also receive back their full capital investment, making it a less risky prospect.

The new products, which are available to Barclays Stockbrokers clients until 17 June 2011, are issued by Barclays Bank and are listed on the London Stock Exchange.