I don't think any are 'free' in the sense that they'll charge your lender for the business, who I guess absorb that in to your rates, but I've used L&C twice now without any hassle and they were able to get me better deals than I could find on my own.
I was just going to remortgage with my current provider but then I read that I should get a broker to get me the best deal.
Could anyone recommend me a free mortgage broker, or do I just to to unbiased.co.uk and pick one at random?