I hate to say it but don't go into the arts looking to make money. You are not going to be in profit if you are shooting for £200 once a month.
The extras will barely cover your start-up cost, if you already have all the gear in place then it would be a little easier but for it to be paid work, you need to have not only the gear but skill the handle anything the environment can throw at you, the temperament dealing with people from all walks of life, the tech to fall back on and time on your side.
For wedding photography you have to be an administrator, a psychologist, IT support, lawyer, best friend, accountant, publicist, blogger, a student and a photographer.
Before and after the shoot you need to deal with admin work, meeting clients, correspondence, IT support on the data. Do the accounts, know a little about contract law. Keep up with social media, promote your business, constantly learn new techniques, from practice and online.
During the shoot you are their best friend, you reassure them for things like everything will turn out great (as you are the one of the few people in the profession that actually sees the wedding from morning to midnight), you need to learn how to read body language and deal with registrars, wedding planner, limo driver, wedding party etc throughout the day.
A wedding photographer also a product photographer, a landscape photographer, an interior architecture photographer a portrait photographer, a street photographer, an event photographer.
You can pretty much throw a good wedding photographer into any of the field above and he or she should produce decent work, all with nothing more than the gear on his back and the wits in his head and work out the best photo for that shot in that 2 second to 2 minute window. I would say most landscape photographer would struggle in a wedding, where as a wedding photographer won't have a problem tackling a landscape photo.