the adviser has to present you with an initial disclosure charge document which will outline how they are paid. It can be by fee or commission or a mixture of both.
If you go to a bank or other organisation, you will only get information on their products. If you want a wider view of your options then go to an independent mortgage advisor. Ask, when you contact them what their fees are.
Its a non obligation first meeting - i was just wondering if they would charge us should we be lucky enough to get a mortgage eventually with their help or advice! X