The solicitor would take about 5 hours at £200-250 per hour. The solicitors goals are to get a winding up order. There will be court and advertising outlays of about £1200. The nominated liquidator would also have to be satisfied that his fees would be covered so the company would have to have assets or the creditor would have to underwrite the fees, often around £5000.
1. The solicitor prepares the papers including the petition, advertising and service documents. He only has to appear in court if the petition is opposed. 2. I can only tell you what my experience is of costs. No insolvency practitioner I know would work for the rates you say the government quote.