The full terms and conditions can be found on the Nationwide website but in summary.
Should you decide to close the fixed term bond before the end of the term you will incurr an interest penalty
from Nationwide. These are
5 year bond 365 days interest
4 year bond 320 days interest
3 year bond 270 days interest
2 year or 18 months 180 days interest
1 year or less 90 days interest.
With all bonds including the ones from Nationwide you should be sure you will not need to access the savings
before the end of the term.