A bankruptcy restriction notice is an entry at the Land Registry against a property that is solely owned by a bankrupt. A restriction is automatically placed when a bankruptcy order is made. It puts on record that the bankrupt is no longer the legal owner of the property and does not have the ability to sell the property or enter into any other dealings in connection with the property - only the trustee can do this.
The restriction will not be removed until the trustee has been paid his legal and beneficial interest in the property. If your interest in the property is returned to you, the trustee will notify the Chief Land Registrar that the property is now yours again.