Interesting to read what the Valiant has said - I'm experiencing all sorts of prospective companies approaching us to cobble together accounts where eg the directors have spent everything the company earned, and there is nothing left to pay tax, employees' pay etc (let alone suppliers); in another case one director has fled the country; in another case the company has arranged the purchase of property in its employees' names and left them carrying the can after the property crash.
The point is that these directors mostly walk away from the company and start another for £100. For all the Experian credit controls in the country that record you or I being a day late with a credit card payment, or track our CVs if we apply for a job, score any of us who rent a home, and so on - there is in practice nothing effective in place to curtail the activities of directors who live well by shafting other people.
There is an exception Josaphine, and I haven't seen it mentioned so far: statutory bodies such as the OFT & Companies House (eg banned directors listings) hold IMHO the biggest fear for these people. MOstly these bodies couldn't catch a cold by themselves, but if you point them at miscreants they can do an effective job of curtailing their activities.
With that in mind, I'd explore the wrongful trading / fraudulent trading route - do some quick research just to get up to speed on it - and threaten the directors of your creditor company with it. Broadly, if they are planning on busting the company they will need to get its activities and closure past the receiver. If you were to threaten to report the matter of say wrongful trading to the authorities as and when the company busts - in fact the threat to report wrongful trading would sit very nicely alonside a statutory demand for payment from you - then the directors are bound to take notice of you. For one, they'd be personally liable for the debts of the company in a case of wrongful trading - not only the debt to you, but others too. Secondly, it would mean a ban on their being company directors in the immediate future. THirdly, it's a criminal offence.
It's the Achilles' heel. Anything else is water off a duck's back, as it looks as though the company might be going under anyway. Why wrongful trading? Well it's broadly concerned with the situation where the directors carry on trading even though they know, or ought to know, that the company has little or no realistic hope of meeting its creditor commitments. Do they have a financial director? Someone with an accountancy related qualification? The courts are usually harder on them - they're the ones most likely to pick up the jail stretch, whereas the MD can shrug his shoulders and say he doesn't understand financials so its not his fault. Anyhow, for those reasons the financial director is usually the best target.
This is a borderline legal / accountancy case and for me underlines the need for combined practices as they have in the USA. You either need an accountant with enough commitment to attack the underbelly of this company; or an accounts-savvy solicitor. Both are rare birds. DIY would be hard, as your creditor company may not take you seriously unless you really mug up and learn your lines.