Well it's payday for me and I've bought a fat stack of tasty NS&I Saving Cert issue 15s! Yum yum yum.
Aardvark I had a look at the T&Cs a while ago and I believe that after the certs mature (3 / 5 years) they earn a crappy interest rate until you put them into a new issue. There's probably a way to reinvest them in a new issue without having to reapply - or you could just cash them out and pay into a new issue.
Ah what the hell, here we go:
QUOTE
Retention after the fixed rate term
44. After the original term (or any further term for which index-linking and/or interest is earned under this paragraph), a Certificate may be eligible to earn index-linking and/or interest for a further term of the same length. The Treasury will decide whether this will apply and if so, on what terms as to index-linking and/or interest. The Director will write to the holder, at the last recorded address for the holding, shortly before the end of each term to tell them of the Treasury’s decision. If such index-linking and/or interest does apply it will be applied automatically and will be guaranteed for the whole of the further term but, of course, the holder will remain free to cash in the Certificate at any time (including for reinvestment into another Issue or another NS&I product).
http://www.nsandi.com/products/ilsc/tandc.jspA further benefit of
reinvested certs is that you can cash them in at any time after maturity and still earn interest even if they haven't been held for a full year.