With the surge in buy-to-let landlords as property values become one of the few reliable assets, HMRC is targeting owners in a bid to raise unpaid taxes. The most recent campaign targeting landlords is taking advantage of the boom in the number of people becoming landlords, following campaigns targeting medics, plumbers and online sellers.

The property sales campaign, which closed in September 2013, collected just under £5m, while HMRC is set to publish the results of the tax take from the first year of the let properties campaign shortly.

Since the offshore disclosure campaign in 2007, HMRC campaigns have brought in £596m from voluntary disclosures and £338m from a large number of follow-up activities. Eight people have been found guilty of criminal offences, with custodial sentences totalling in excess of 10 years handed down and leading to the recovery of £593,000.