Charge on house - after nearly 9 years!

OK guys ... have I hit on a no-no? Have I said something out of place? Or does no one have any advice for me?

Hi, my divorce was finalised over nine years ago after a catalogue of fiascos by my solicitors. One went to jail for fraud (not against me - I have nothing to steal), one lost the policy for my endowment policy and forgot to transfer it into my name before the merger, losing me a £4000 cheque that ended up going to my ex - etc etc. Anyway, In December 1999 I signed the paper to allow a charge on my house because I did not have the money to pay the £7,500 legal fees that had accumulated over 5 years of non communication by my ex's solicitors that was not satisfactorily chased by my deadlegs. The charge had not been applied and I was hoping I had escaped - until I received a letter today telling me that the LSC were applying to the Land Registry to put the charge on. They also say that the interest will be backdated to when the charge was applied. My question is: can they do this after nearly 9 years? Do I have any recourse at all? Please??!!