The lender, part of Yorkshire Building Society, will offer reduced rates on a number of products at 65% loan-to-value from Monday 14 July for a 10-day period.
The discounted range includes two- and five-year fixed rate mortgages, many of which come with fee and cashback incentives.
In total, 20 products will be on offer across its buy-to-let purchase and remortgage range with rates starting from 2.89%.
Toni Roberts, buy-to-let product manager, said: “We always seek to offer competitive mortgages and we are going even further with this promotion.
These products offer terrific rates and they will be popular with those people looking to invest in a buy-to-let property.
“They will only be available for a limited period so the message to brokers and customers is ‘get them while you can.”