The online check at a post-office is not very thorough though. I have twice gone to tax a car that has previously been Sorned and the post-office saw it as already taxed. I would hope that this means that they do not get to see whether a car is taxed or not, only that it is not outstanding. I hope that the checks for MOTs are accurate and clear.
I wonder why the post-office need an insurance certificate? Surely they can see the insurance database?
SteveW