Maybe some of you recall that I have posted about this topic before. It happened to us as long ago as 1995. We bought a bank foreclosure and the full price was declared on the escritura. It was such a good buy that we bought another. First one no problem but the second one we received a bill from Hacienda for another c. 2000 pounds. Our Lawyer said we could appeal but the money had to be deposited anyway, plus we would have had lawyers fees and was advised that it is very rare to win this type of case against hacienda.
However, we paid such a low price we thought that this was just an annoyance and matter of principle. Even if we had been forwarned we would have still proceeded. I agree it is unfair though.