UCB Home Loans has identified 20 top spots for buy-to-let investment in the UK, which include Aberdeen, Brighton, and Watford.
The market is buoyant - over the last six months "lenders advanced £17.5 billion on 152,500 buy-to-let mortgages, surpassing all records" according to UCB managing director Keith Astill.
Growing student and migrant populations from new EU countries are fuelling demand, the specialist lender adds.
Analysts suggest that the above-average rate of increase in rental incomes in London and the south-east may be partly caused by a higher concentration of immigrant populations in these areas, which drives the demand.
Meanwhile, several prominent university towns feature in UCB's top 20 listed regions for buy-to-let investment, including London, Nottingham, Sheffield and Southampton.
The market is also boosted by the difficulties young people are experiencing in getting a first foot on the property ladder, which means many rent for several years after leaving university.
Last month, the Royal Institution of Chartered Surveyors (Rics) reported that rent levels countrywide were rising at their highest rate for six years.
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