What are the reasons for doing this, if you are new to the game I would not suggest this is a great way of making a living, not saying it can't be done but colleges are handing out pat testing quals like there going out of fashion. So therefore the "going" rate can be anything as low as 75p per item and most would agree that there are allot of people out there who are just sticking green stickers on things without proper test as at 75p item to make a profit doing things properly would be hard going.
Unless you know you can get in with some companies as its more about who you know with pat testing IMO.