If you are looking for mortgage advice due to problems making payments then have there are many options available.
Companies like Compass Property Buyers can purchase a house the same day allowing you quickly sort out any problem and will work with you to arrange an exchange date in your favour helping you sort things out.
Selling might not seem an option but if you cannot make payments it is better to sell fast to a company like Compass and then have time to resolve problems than to end up loosing everything and being repossessed.