If I may simply pay attention to the emotions that resonate in your descriptions, Peter, that is how I would understand it. The goal is to achieve functionality and driving pleasure at a reasonable cost. That's a relative statement, of course, because you also want to maintain status and horsepower. Besides the fun cars, a Skoda Oktavia would be enough for me if our E Class estate hadn't been driving wonderfully for 12 years, especially as we don't depend on it for work.
I'll have to look at your cars in detail. The Tesla seems to be the car that almost generates anti-feelings. I would get rid of it. Your wife doesn't seem to have a special relationship with it either.
Your wife likes her C Class. As long as that is the case, this car is out of the question. The question remains about possible overlaps in the use of Tesla and C Class. What can one car do that the other can't? Do you travel a lot in parallel with your cars?
Then the Plus8. Here we are most concerned with emotions. And that's where I can give the least advice (a little bit below). But instead of looking at all three cars at the same time, it could be a start to sell the Tesla...and then see how important a third car is.
A quick word about the Plus8. I hear a certain ambivalence in your posts, not only in this thread. On the one hand, you seem to be a bit tired of it for different reasons. But all in all I think the main emotional motivation would be the fun of a change, something new from the Morgan world...no matter how "sensible" it might be to keep the Plus 8, it seems to offer the same driving experience over and over again since 8 years on the one hand and our remaining lifetime on the other hand leads to interest in a change. One wants to experience something new once again. Well, everyone is different, but it seems to be really important to you, and I can fully respect that. I, on the other hand, am happy that I have been able to make my 4/4 better and better for the past 8 years and I am looking forward to continuing to drive it. But maybe that's where the issue starts for you. Because, it's not a question of loving your V8 (although perhaps it's a bit boring to experience the same thing over and over again). It's a question of what it should replace.
Just thinking about it obliquely...what would your driving experience be like if it was a very nice Trad again? That you forgive its roughness and learn to love it anew for its quirkiness?…instead of a Plus Four or Six, which might be very modern and comfortable to drive, but also a touch more ordinary. On the question of Plus Four vs. Plus Six, I see you with the Plus Six, I don't know why, but it suits you better than a 4 cylinderin my view...even if you have to be a bit careful when driving, it stands for the values you like, a silky smooth engine and the superiority of endless and not always needed power.
