UK based here. Best sites to make money online?

Hi i'm looking for some advice on the best sites to earn money from as a UK resident. I work from home currently (IT) and find myself with plenty of time during the day which I could be using to make more money so am looking for sites and advice from people in the UK already doing it. Feel free to post your referral links when providing advice and i'll use it to sign up as a thank you.