mrsmon,
Don't pay any attention to PDLMHe relishes playing
the role of a curmudgeon who doesn't suffer fools gladly
or at all, but I've seen him take the trouble on several
occasions to be helpful to a newbie, and he has an enviable
cache of bookmarked websites . . .
Speaking of which, I believe most of the major property
agencies' websites have historical transaction information
repackaged from the land registry; here is one that
may have what you're looking for:
Ricadata - Home Page