Credit Card to Bridge Small Money Gap

jimmyc_2009

Hi all,ive been uming and arrgghhing about my future mortgage deal as mine runs out at the beginning of may and am going to go for a 80% tracker from the post office now the problem is the valuation if i state my house is worth £127500 which i think it is then they turn around and say its £125000 could i use a credit card to bridge the gap kinda thing to still get me my 80% deal the money would be paid of in 12months interest free if i cant do that do i have to pay for the valuation as they state they do the valuation free of charge but if ive over estimated my house price its my fault so will i be liable and charge me for standard valuation?

Thanks J