I live in Ohio (USA)....about as far inland from any plate boundary you can get (except maybe Nebraska) and we have earthquakes all the time. The difference is that we can't feel them. But there is a fault line that goes right under central Ohio. The recognized "plates" are the major bodies of tectonics, but in all actuality, the entire earth is just a hodgepodge of millions of minor plates, some with their boundaries really far under settled sediment, such as Ohio and possibly Britain.
I actually wouldn't be surprised to find a minor boundary or four up by Scotland, with the Highlands and all.
The best way to illustrate the concept is a cookie. The cookie has lots of little cracks all over it (if it's baked at home and not bought in a store) but has a definite edge. The edge of the cookie is like the major fault lines (pacific rim, Baja plate, etc.) but all the little insignificant cracks are the minor fault lines. And Ohio is a chocolate chip. Because it's tasty and I want someone to eat it to make it go away. (I hate Ohio)