Investment -it's rationed! good is so This 3% Defence Bonds are a Full Trustee security so advantageous to the holder that no individual may hold more than £1,000 in these Bonds. Here are points that everyone ought to know about 3% Defence Bonds:- Price of Issue— £100 per cent. Repayable after 7 years with a premium of £1 on every £100. Interest 3% per annum paid half yearly—May 1st and November 1st. Bonds commence to earn interest from date of purchase. They can be bought in sums of £5 and multiples of £5.