Of savings and investments I am managing myself (i.e. excluding my workplace pension), I personally have about 30% in P2P loans. I think a lot of people would argue this is too high given it is a relatively new asset class but I feel comfortable with it
Depending on how much you invest, you can achieve a higher rate of cashback (up to 10%) via Kufflink’s refer a friend program. Terms here. I have a referral link for Kuflink in the referral wiki