Lifestyle Option 1 invests entirely in shares until you are 10 years from retirement.
Historically shares have offered opportunity for optimising investment returns over the long term, but their value does go up and down and they can produce negative returns over the short term.
If you are joining the Scheme as a new member, this is where your contributions will be invested, unless you tell Group Pensions in Halifax that you want to invest in a different option or fund.
more about investments
