High demand, low supply and impressive yields make investment in the private rented sector an attractive business opportunity in the current climate, with many existing and prospective landlords looking for ways to build a profitable portfolio.

But despite all the talk of the need for landlords to help meet the nation's housing demands, it's not uncommon to hear of cases where investors have had their applications for buy-to-let finance turned down as a result of restricted lending policies.

So if landlords are going to be successful in their attempts to secure the funding they need in order to boost the supply of homes in the private rented sector and increase their number of assets, one expert explains that they need to ensure they have a clean credit rating.

"The most important thing is to try and keep clean credit," said Lee Grandin, director at Landlord Mortgages.

"Lenders are not interested in anyone who has got any adverse information on their credit files, which means late payments on anything from a credit card to a loan or mortgage."

While existing landlords may find it somewhat easier to generate finance if they're already running a successful portfolio, it seems that anyone thinking of investing in the lettings game for the first time could face difficulty if there are any stains on their credit history.

Indeed, while tenants make a financial commitment to their landlord when they agree to pay the rent, landlords do the same with their lender when they take out a buy-to-let mortgage, so the banks want to be certain that there aren't going to be any issues with missed payments.

Yet if investors are successful with their loan applications and are looking for ways to safeguard their financial position, landlord insurance policies are a sensible purchase to cover the cost of any damage to their assets.