Getting a liquidator will cost, there are some adverts for low cost ones, but I don't know how they can make money at those rates.
Also be careful what you write down or type anywhere, once you have decided that the company is insolvent and shoudl be wound up, paying some creditors in favour of others is dangerous, the banks are creditors also.
Could you (especially if you have signed personnal guarantees) contact the banks and extent the loans (reduce the monthly payments), would some of the subcontractors be willing to give discounts (it never hurts to ask - just say you are considering liquidation and ask what they would accept in full and final settlement - there maybe extra VAT due on the issuing of credit notes).
One of the earlier posters suggested renting out the house, would that help if you could reduce the finance repayments?
Basically I'm suggesting looking at ways to survive until you qualify for the voluntary strike off, as that is much cheaper, but the company can have no assets or liabilities, so the creditors would have to be settled and the assets sold.