Some banks are still engaging in debt consolidation. Your own bank may consider this if the other debts you have are with them. The main banks at the moment seem to be reluctant to take on other institutions debts.
From what I have read on this and other forums, you will find that of those still engaging in debt consolidation they will only let you top up to 70% or 75% of the current value of the property. I think your best bets are:
Halifax (HBOS) - best rates
ICS (part of BOI)
Perm. TSB
KBC (formerly IBB Homeloans)
Have you considered options other than topping up?
If you post the details in the Money Makeover section other posters may have a different viewpoint on your options.