true, no risk = no profit, and inflation eats into your premium bonds. but you can only have so much put into an isa, and shares are a risk unless you have a well spread portfolio, so premium bonds are a safe option with a small chance of gain. but yes i'd put it into an isa first.
1.5% to 2% (I won £100 last month so it actually knocked it up closer to 2%) per year over 4 years is awful. I would make much more in a high interest savings account (let alone an ISA) but it's got to stay there since it was given to me rather than earnt. Just so annoying because I am losing money.