It's great to hear that you recognize the importance of diversifying your savings and not relying solely on Bitcoin as an investment. While Bitcoin can be a great long-term hedge against inflation, it is important to have a mix of assets that can provide more immediate liquidity and stability.

As for what to do with your prize money, it ultimately comes down to your personal financial goals and risk tolerance. If you are looking for a low-risk option with a chance of winning more prizes, buying more UK National Savings premium bonds could be a good choice. On the other hand, if you are comfortable with the risk and believe in the long-term potential of Bitcoin, buying some Satoshis could be a good way to participate in potential future growth.

It's important to note that investing in Bitcoin carries risks, as its value can be highly volatile and subject to sudden changes. Therefore, it's important to only invest what you can afford to lose and to not put all of your savings into Bitcoin.

Ultimately, the decision on how to use your prize money should be based on your personal financial goals and risk tolerance. If you are unsure, it may be a good idea to speak with a financial advisor who can provide personalized advice based on your specific situation