If you link Google Adsense to Youtube you can gain money from ads displayed on the videos. It is highly dependant on the popularity of the content, the ad bidding costs, nationality, on views, minutes watched, ad placement etc. The same thing applies with a Youtube Network gaining money by Google Ads.
The income would be regular as long as I continue to upload videos, so the payments too would be regular, but the cash earned can vary month to month as I must rely on people to play and share the content. It will never be a set payment. One month as an example it could be £100 for the month. July would be the Summer Holidays so that could then rise for a month and then drop again.
It is not my intention to do this sort of thing full-time. I'm looking to get myself employed as soon as possible. The declaration of any earnings is the only issue. I wouldn't like to leave it for months/years and then be fined/jailed because I didn't follow the proper channels as I didn't understand it atall. I'm not earning thousands a month here, not even hundreds a month, at the end of the day though I'm still earning something .
This is why I came here to know for sure as this forum is probably the next best thing for support. I wouldn't want to phone HMRC or Universal Credit until I know if I need too, otherwise I could complicate things even further as we all know the Job Centre have the tendency to mess things up.