Thanks everyone. The thing is, looking at the sides of the tooth, it really isn't vertical - it is angled inwards at the bottom and outwards at the top. Sorry, that's a really rubbish explanation and I realise the picture above doesn't show this very well thanks to that lovely long flappy bit of gum that I have (more technical terms!)
The brief I gave my orthodontist was "I am getting married in Autumn 2015 and I want a nice smile". His response was "No problem, that should be doable - even if we're only 90% of the way there we can take them off for the wedding and finish it off afterwards". No hint that further work might be required. He did also say at the 45 minute appointment before the braces were first fitted, when I was photographed and x-rayed from every angle imaginable, that a couple of days' discomfort was normal, nothing that paracetamol wouldn't fix. Of course, some teenagers complained that the pain was unbearable, but teenagers complain about everything, don't they? I was a bit
at this, which is why I've not mentioned much about the pain to him.
Just to also add - I am extremely dentist-phobic, but have the utmost respect for the profession with the exception of the sadistic swine who drilled into a nerve when I was six or seven, then bellowed at me when I screamed and flinched involuntarily with the pain and haven't even said anywhere that I intend to go for a second opinion, change orthodontists or lodge formal complaints - my OP was about whether I should insist that my front tooth is not right, or if I should trust that it would all come right in the end. Truly, I am an utter opposite-of-assertive wuss and need the two weeks before the next appointment just to work out what I am going to say, which will probably involve me apologising profusely to him for being unhappy!
Code - I'm glad I could make you smile with my leaning tower of teetha 
Mewling - thank you so much for posting. Most people tend to only do these things once in our lives, so it's hard to know what's normal and what isn't. Knowing someone else had this much pain is actually a comfort (in a really weird way!). I'm so pleased you're happy with your end result. I hope I have the strength to carry on to the end of my treatment.
I have an ordinary dentist checkup appt before my next braces one, I might ask to see her last x-rays of my teeth to see what position the root was in and how wonky the bottom looked compared to the actual vertical line of the tooth.
Wow, sorry, that turned out to be war and peace!