It's critical to get a mortgage right because it's one of the most important financial decisions you'll ever make. In the United Kingdom, there are plenty of mortgage brokers. Depending on their independence and experience, a mortgage broker's access to lenders panel can differ.
The most important thing to find out is if they are tied to any specific lender(s) and if they receive favourable fees or commission from any particular lender(s) that would lead them to favour them over others.
When lenders (usually banks) and brokers suggest a mortgage for you, they must give you advice.
They'll look at your wages, as well as your loan repayments and day-to-day expenses, to determine how much of a mortgage you can afford.
So basically mortgage brokers near London areas can help you in many ways.