Same as title, If I was somehow sent to London durning the 1800's assuming I have all typical modern vaccinations how likely would I die from a plague? Which ones would I be safe from? Which ones would I be vulnerable to? Are there any other non modern eras that I would fare better or worse in?
This is more of a science than a history answer, but it's not a simple matter of your modern vaccinations being able to protect you from disease if you were to go back in time. Being vaccinated means that your immune system has been "trained" to recognize a particular pathogen and fight it more effectively. However this process is very specific and a vaccine can typically protect against a few strains of a disease at once. The major problem you will run into while time traveling is that diseases mutate and evolve over time just like any other organism. This is obviously drastically simplified but basically how it works.
This can happen very quickly in the case of something like a virus. For example novel strains of influenza can emerge from year to year, which is part of the reason that flu vaccine has to be re-formulated every year.
So over the course of a century or two, who knows how many common diseases, even things that you are vaccinated against would have changed enough that your exposure in your time would not protect you against the past strain of the disease.
So you would be just as likely as anyone else to die of plague, arguably more likely since many things that your immune system would encounter are a little bit off of what your body is used to. And this does not even count things like smallpox which no longer exists but would have been endemic even 100 years ago.
This problem would get worse and worse the farther you go back in time, and several millennia ago you would have to also be careful that you don't cause an epidemic with the future pathogens you carry back with you.
I found this interesting document on causes for England in the latter half of the 19th century.
Some of the big killers (measles, diphtheria) would be covered by vaccines. But many would not (smallpox, scarlet fever, cholera, tuberculosis, typhoid, and typhus), and you would be very vulnerable to these.
If you had the resources you could potentially avoid some of these (the GI bugs) by taking sanitary precautions, like boiling water. That wouldn't help you with smallpox, tubercuolosis, and scarlet fever, but avoiding the sick could help. Hand hygiene and wearing a mask could help avoid scarlet fever, and potentially TB and smallpox depending on the strength of the barrier (both are transmitted as aerosols and so can float through the air in tiny particles for quite some time and get around simple masks). But really you'd be best off leaving the city.