65 plate Mercedes Vito

If you like taking risks fair enough. That is not going to be deemed acceptable by DVSA. It must be logged on, a full test carried out, then logged off. They have never given an option for any other type of routine.

Why did you not just fail it and then do a retest

If it has been abandoned, then it doesn't go on the system as a test does it? That means you have recorded one very short test for the vehicle, so I would call that a risk. It would be a mistake for DVSA to allow anything other than log on-do full test-log off in my opinion. Once you start watering that down to cover methods such as you have described, then where does it end? How then do you prosecute offenders if testers can make up their own routines?

I thought once abandoned that a full test must be carried out again irrespective of it left the VTS or not. I was somewhat confused when you mentioned two mini tests? As I understand it now are you saying you tested two MINI's and then did a partial retest of the Vito but put it through as a full test! If that is the case DVSA would not know any different, they would just see the test time maybe much quicker?

Fail it and brake test not conducted.?

At least on a retest you might be able to fail it on some braking deficiency, then it would need a full test again, double earner!
A woman brought a Merc in for test the other day, I recognized the reg,and said but your husband brought it in for test in August, so there's 9 months left on it!
She went red said sorry and left, to bring in the van that did need testing!
I think some people are losing the plot!,or they don't talk to each other?