No problem at all! As you say, it is a very personal decision but happy to share my own experiences if they can be of help!
Keele's current MA course structure hasn't really changed since I took it (a couple of optional modules are different as those tend to depend on staff availability) so you can actually see the modules I undertook and the course structure here:
https://www.keele.ac.uk/study/postgraduatestudy/postgraduatecourses/englishliteratures/#course-structure.
As you can see, there isn't really anything there that is either medieval or eighteenth-century! However I was able to complete some of my assessments on related topics. For example, my assessment for the core Criticism, Analysis and Theory module was on book history and I used Thomas Malory's
Morte D'Arthur as my text of choice for that. I also opted to take the optional Work Placement in the Humanities module and arranged a semester-long placement at a local museum that specialises in the eighteenth-century writer Samuel Johnson. And, as I mentioned, my dissertation was within my specialism - I looked at the formation of English masculinity in the Arthurian narrative between 1760-1850.
Whether you have similar options to sneak in some of your specialism/interests really depends on the course you're looking at. Studying texts from other time periods and genres can be very helpful, as is building up a good solid base of knowledge across the literary canon (especially if you want to go into academia as you never know what you might end up teaching - I currently teach an undergraduate module on Shakespeare, for example!).
As an example, my MA thesis ended up using literary theories about ageing to examine masculinity - which was something I learned about whilst studying Byron's
Don Juan on the Canon, Anti-Canon, Context module. I also studied
The Last of the Mohicans during my MA year, and the way that was taught made me think in a different way about how the English Literature of that period might be connected to wider world events, such as the loss of the American colonies and the French Revolution - a line of thinking which is now feeding directly into my PhD work. Sometimes thinking and working outside of your specialism can be hugely productive - and can introduce you to new theories and ideas that you can then apply to your own research interests. I had no intention of looking at the afterlives of medieval literature - when I began the MA I wanted to do my thesis on a medieval text - but my MA year modules actually introduced me to the idea of medievalism and to the fact that there was a gap in the research within the eighteenth-century, as well as to how interesting the long eighteenth-century was as a period!
In terms of taking a break, personally I did find it helpful - I needed some time out after my BA to refresh and recharge (and to get my passion for studying literature back again - I loved my BA course but three years of studying is a long time and I wanted to read for fun for a bit). It ended up being a much longer break than originally planned (mainly because I went and got married and bought a house) but I do feel that, for me, the break made me a better MA (and PhD) student because not only did I know that I definitely wanted to do the MA and PhD (because I wanted to change careers into academia) but also because I was able to bring my work ethic, skills, and increased personal confidence into my postgraduate studies. And it did help that I'd been able to save up some money to support myself during my MA year - it can be a very pressured year so, whilst I did continue to work part-time, I wasn't under pressure to take lots of paid work because I had my savings.
Amy Louise