He added: "More than two million individuals have an investment in residential property, but most have no access to up-to-date and timely information about frequent changes to the law.
"Landlords have an absolute obligation to keep up-to-date, but this is becoming increasingly challenging."
Concerns have been raised recently that landlords are selling up as these tax and regulatory changes start to bite.
The number of buy-to-let properties up for sale increased by 25 per cent in April in a sign that more landlords were looking to exit the market.
Chief executive of buy-to-let specialist John Goodall said the "doom" surrounding the sector was overdone, however, and suggested the changes were likely to scare off smaller landlords and lead to a more professional industry.
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