There isn't too much of a problem, except if you are selling within 5 years of purchasing and get clobbered for capital gains tax. This is because you pay CGT on the difference between what you paid and what you sold it for - and what you paid will be taken from the value put on your new tapu at time of purchase. So you may have bought for 50k and be selling for 60k (25% CGT due on 10k - you pay £2,500) but based on tapu values you may have documents claiming you bought for 22k and are now selling for 60k (25% CGT due on 38k - you pay £9,500 ).
CGT is not due if you have owned the property for 5 years or more these days.