Tax on apple earnings/online sources of income

Hi everyone,

I'm a PAYE worker in the top tax bracket. I have now got a minor source of income coming from apple, its about 100e a year. I cannot figure out whether I declare this to get tax taken off it or not. I did the apple US tax id stuff but earned pretty much nothing for ages. Now I've made a little bit I would like to be sure I am tax compliant. Anyone any advice?

Similarly I've just enabled youtube ads. I probably won't make anything much but should that be declared?

Any help appreciated, I've looked online but my head is done in!