Taxes owed by a limited company are different to personal tax owed, so it is not the same as Lester Piggott and Boris Becker whom I believe, were engaged in some tax evasion pratices.
The taxes owed by Scunthorpe United are likely VAT on sales, and perhaps income tax that they will have deducted from employees wages when they paid them. Depending on their setup with HMRC most organisations will pay these taxes quarterly, or yearly. Failure to pay these on time can result in penalties being added to the amount too, and this will only compound the issues.
In short, Swann and the directors are protected from this taxation debt as the debt is owed by the iimited company and not the directors.