The cornerstone of democratic philosophy is that there's a huge difference between a central democratic government and some lord.
Landlord in your usage is a different terminology. In the UK a lord with lands either doesn't have the ability, or in practice, does not raise the land rents arbitrarily. Perhaps someone knowledgeable in UK properly law could weigh in.
As other have said, in theory it is different. In practice it isn't. A single property owner has about as much chance of swaying the central government as they have of swaying the earl of whatever.
Of course, a number of famous landowners are Lords - notably the Duke of Westminster who owns vast amounts of London: