Affiliate Marketing Secrets

I have looked endlessly.
I want an option to do some work online for just a couple of hours a day, i dont need to earn a huge amount just some extra cash for of the some things i want like a holiday or a new phone. I have found a few ways but to be honest i cant be bothered spending 30 minutes on a boring survey for just 50p.
The other condition is im in the UK so finding sites is a bit more difficult as alot only offer US residents or pay in dollars which isnt too much of a problem but i would prefer if it was a straight UK site.
SO, what ways are there to make money online? I was thinking about making a site with affiliate programs+ adverts etc.
What I want to know is what YOU have already tried and failed/suceeded in. I dont mind spening time making something like a website as i have the patience with more design work unlike surveys.