James,
It is most important that your mortgage broker compares “apples with apples”. The features of a loan such as costs, term, interest rate, accessibility, etc… all add to the cost of the money and affect your monthly repayments.

This, coupled with a lenders benchmark rate, acceptable income, and cost of living standards, all affects the amount you can borrow.

Using my calculator for a single person on 50K with no debts I get a range of 206K – 325K spread over 91 product variations.

It is all a balancing act “features” : “Amount” : “Rates”

Tony.
[email protected]
“Making Finance Easy”