After painting a room a few times the paint seems to have some sort of ripple effect and isn't very smooth. I started in a back room to test it out and now worried about starting the main rooms in the house. Any idea what would be causing it? I've tried to capture it in the attached photo https://ibb.co/b8tte5
I assume the walls were ok before you painted them? It is your roller causing the ripples as you've overloaded with too much paint!!
You need to use a medium roller sleeve (short pile) for a smooth finish, & you should always wash a new roller before use. Been using these: http://www.screwfix.com/p/hamilton-perfection-roller-sleeve-medium-pile-9-x-1/10175 The 12" version has short pile.