We have 2 or 3 electricians who we work with and they will always put the spurs in for us and test. I actively use the fact we do not install the spurs (as we're not qualified and/or more importantly competent ) and those other firms just chucking in spurs are probably breaking the law.
Those non-electricians who install spurs - do you test the work you've done and do the paperwork etc? Thought not.