if the electrician is neat tidy and you have no doubts about him
then why do you state that you WONT have him back to issue a certificate.
You do not need to be part of a competent persons scheme to issue a certificate.
The fella,
if qualified will have test equipment, or be able to use some from somewhere as if he really is a practicing electrician doing his own jobs he will be needing it for all the other jobs he does.
the other things he will need are a current copy of BS7671 and a photo copier. As before, if he really is a practicing electrician doing his own jobs he will have a copy of BS7671, so he needs to speculate 50p of photocopies of the Electrical Installation Certificate contained within BS7671.
I'm sorry to say that you have tried to cheat the system, dramatically failed, probibally not saved any money, it will probibally cost you more in the long run, look at all the greif so far and it's still not signed off, if you cant resolve the issue there may be problems when selling your home, there is a possibility (not known it hapen though) of a fine upto £5000, your work is untested and therefore must be deemed unsafe, it shouldnt have even been energised without testing it.
If you had looked online prior to the work, then only an idiot would deem it cost effective to do a small job like replace a consumer unit without using the 'competent persons scheme'.
You paid £120 to inform the LABC of your work, i pay £1.50. You paid the LABC 4 hours of a competent approoved electricians costs to do 10 mins of looking and you have got nothing.
I would love to see the install, I would also love to know the out come, i would mainly really really really love to know all the costs involved with taking the cheapest route.
You need to get this guy back to issue the certificate, another electrician cant sign off someone elses work as their own, for obvious reasons.