The number of approvals fell to 65,500 in August.
She joins from The Mortgage Lender where she progressed from key account manager to national account manager.
The programme will cover a range of specialist sectors.
There were 30,720 new first-time buyer mortgages completed in May, 0.5% year-on-year.
Furthermore, there were 25,450 homemover mortgages completed in April, 6.4% more than in the same month a year earlier.
The proposition includes flexible criteria points, rates for non-traditional tenants and landlords and complex properties and is available for individuals, professional landlords and limited companies.
The move will initially focus on areas such as later life lending, expats, foreign nationals, adverse credit, self-employed and contractors.
Parr is well known in the industry having been in bridging finance for over 12 years.
There were 25,100 new first-time buyer mortgages completed in January, 4.6% more year-on-year and 25,300 homemover mortgages completed in the month, 2.8% more year-on-year.