Whilst you could invest in any number of fixed rate bonds - to mature at different times I wouls consider a number of other options; you don't mention how old you are? I would suggest that you spend part of your inheritance on travel whilst you are fit and well; also on any home improvements that you want; also give some away to your family - if you have children setting up home - they may as well have the benefit of some help now rather than later - and you could see their enjoyment whist they are young.