The mortgage for LSL, which includes Pink Home Loans and First Complete networks, is available for purchases at 5.99% with a £999 fee.
The lender is also launching two 85% LTV fixed rate mortgages.
The 85% LTV mortgages will be a two-year fixed rate purchase and a two-year fixed rate remortgage, both offering an initial rate of 5.29% with a fee of £999.
The core range two year fixed rate 80% LTV purchase mortgage will see its rate reduced by 0.1% from 4.49% to 4.39%.
But a number of other core range products will see their rates increase between 0.1%-0.4%.
Mark Bullard, head of sales at NatWest Intermediary Solutions, says:“Following dialogue with our intermediary partners, we are pleased to introduce the two new 85% LTV products which now gives us a very broad range of mortgages across the LTV mix from 50% right up to 90%.
“We have been delighted with the demand from intermediaries for our products so far this year and will continue to build on the success of our joint efforts to improve application packaging which helps us to preserve our service standards and speed to offer.”