Lets just be clear on one aspect. The lender is not giving a valuation on what a property is worth but it is giving a valuation on what is a "reasonable market value". This is what the lender could reasonably expect to sell the property for if it had to repossess. In quite a few instances this could be very close to the property worth and in other instances it could be below. There is nothing to say that the houses close to you did not sell for above the reasonable local value or that it may have extra features or that it was surveyed through another lender.
If you feel that the lenders valuation is way below what you should reasonably expect then there is absolutely nothing to stop you asking another lender for a remortgage. Most mortgage lenders have schemes that will include a free mortgage valuation. Quite a few lenders do now charging small booking fees but ther are still plenty of lenders that charge nothing until completion of the mortgage. Approach a lender and place an application with them, if there valuation comes back at the same level as your own lender then you have to take it on the chin and accept that your view of the valuation is possibly skewed. At least you will not have to pay anything to find out.
Most people nowadays do still over value their properties probably an unconscious unwillingness to accept that true property values have dropped so much in recent years. Most lenders do give fair valuations on properties, they don't work in cahoots with their surveyors and to call someone unprofessional because your opinion and hopes differs from their profesional opinion in their chosen professional career for which you are not qualified or experienced is just petty sillyness.
Zeb:Would you question a doctor's diagnosis? or a solicitors legal view on a matter? How would you feel if someone unprofessional and unqualified questioned your professional opinion on what you do for a living? What ever the surveyor has professionally decided it will have been done so by using far more knowledge and experience, data and tool than you can place on the subject and he will be able to back his findings up with evidence of his reasoning. Speak to the surveying company ( the lender should let you know who this is) and they can get the surveyor to justify this to you
If you have a problem with your own lender, go speak to a mortgage broker and have him sggest where may be best to apply for a good rate that suits your needs.
One thing I will say on your own defence is that to me it is quite apparent that the Automated Valuation Model used by Halifax does often reduce property values below where they may be reasonable but this is the lenders own calculation and they are perfcectly entitled to use it, if you don't like it they do not force you to use it and you can always go to another lender.....or accept what they offer to you. To threaten legal action is just laughable when you have so many other options....especially as the lender is uder no obligation to lend to you any way, they could just decline the risk of your mortgage and do not neccessarily have to justify the reason other than unacceptable risk.