Early redemption fees are not the same. You got a special rate in return for agreeing to stick with that mortgage for x number of years or pay a penalty.
Exit fees - which you are charged when you pay off your mortgage early, and cover admin charges, land registrations fees and so on ARE considered to be a charge and can be reclaimed if excessive.
Read all about it from an independent financial expert:
http://www.moneysavingexpert.com/cgi-bin/viewn ews.cgi?newsid1170081918,22653,