No way. Premium bonds pay low interest. National Savings and Investments, will only pay 3.4% gross, 2.78% net.
Set aside an amount for emergencies in an easy access account. The rest can go into bonds - there are even some short term bonds paying 6.8% gross for 6-months term, so every 6 months you can re-evaluate your situation. With 50K tax free, you don't need to sacrifice interest from your savings for the vain hope in winning the lottery.