If they are insolvent (which if they can't pay their debts, then they definitely are) then all creditors have to be treated equally. You have no more right to that van than anyone else they owe money to - and even if they agreed to let you have it in payment, the court can then order you to give it back.
See here under 'Preferences'.
As much as I would normally agree to this principal, from what I can gather is the van is pretty much their only substantial asset plus some office furniture and equipment and they owe over £200,000.
Therefore, unlikely any creditors will get a bean and only the insolvancy people will get any money from this.
