It is generally the case (though not always!) that courts are reluctant to enforce monetary award adjudication decisions in favour of companies in liquidation (CILs). This is because of the uncertainty surrounding the CIL’s ability to repay those sums should it later transpire it was not entitled to the award.
1. Can I lock the tenant out of the property until they pay?
No. If a tenant has been placed in administration then there will be a moratorium in place. This gives a company some breathing space. Rights against the company, such as forfeiture or conducting legal proceedings, can only be pursued with either the consent of the administrator or a court order. As noted last week, changing the locks is likely to forfeit the lease. Unless you intend to forfeit and obtain the necessary permission to do so, you should not change the locks.