LONDON (BLOOMBERG) - The cost of renting a home in London fell for the fourth month in a row, continuing the first period of decline since 2009 as Britain's exit from the European Union rattles the UK capital's real-estate market.

The average monthly rent paid for new lettings in greater London in July was £1,564 (S$2,775), a 0.6 per cent decline from a year earlier, according to a statement from HomeLet, the UK's largest reference-checking and rentals-insurance company. Rents across the UK gained 1.1 per cent overall, led by increases in Northern Ireland and Scotland.

London's housing market is weakening as uncertainty surrounding Brexit adds to affordability issues and new taxes, and the capital is now acting as a "brake" on the overall UK market, HomeLet said. Landlords rushed to buy homes before the introduction of a new stamp-duty sales tax in April of last year, boosting supply and leading to greater competition for tenants.

While the pace of decline in London has slowed, "the capital's rental market still looks transformed compared to this time last year, when rents were rising at a rate of 6.6 per cent," HomeLet said.

Home prices in the capital are rising at the slowest annual pace in five years, data from researcher Acadata show.