Do you have much spare time in the evenings? Can make your money go a lot further match betting tbh, a few blues on here have been doing it and can vouch for me (have a different name on the site i use). I have done it for a couple of years now, made 40k plus and I started with just 5k capital. Gambling transactions are already taxed too which comes in handy!
So yeah if you have some spare time in the evenings and weekends I reckon you should put your money into that instead, you will make more in one month than it would in 1 year with premium bonds.