I'm sure a lot of you on here will be well aware of 20cogs, it's similar to ohmydosh in that you complete offers (such as trying free trails, downloading apps, etc.) for money. None are too spammy and even if you match betted previously (so are unable to do the gambling offers, they offer 1 per cog) you can still easily complete the 20 offers in a few days. You have to wait 30 unfortunately to cash out (some of the offers take a long time to validate).
Most of the offers pay you between £5-10 a pop.
In addition, they have a very generous referral scheme which you get 5% of someone's earnings for a lifetime as well as £10 when they cash out.