U used to need 1 commercial and 1 domestic job.But as long as u show that u can do emergency lighting,fire alarms and electrical installation of 2 jobs this should be enough in a domestic sense.u also need 2 do the domestic installer for 2 years to go for the approved contractor scheme.You need 2 show that u can periodically test and broaden your horizons than just wiring,to show that u are competetant to do most electrical work.