Your maximum annual investment in ISAs for 2013/14 is £11,520 (up to £5,760 of which can be saved in a cash ISA).
Your investment needs to be made before 6 April 2014.
In addition have you thought about investing for your children or grandchildren by setting up a Junior ISAs or pensions?
In the 2013/14 tax year, you can invest £3,720 into a Junior ISA for any child under 18 who does not have a Child Trust Fund.