You don't say what type of asset you are concerned about. If it is things such as jewellery, valuable furniture or antiques, or savings/shares etc., then all of these are nothing to do with the Official Receiver if they were bought by the non-bankrupt partner (& this can be proved if queried) & are in the sole name of the non-bankrupt. They would simply not be put down on the bankrupt's "Statement of Affairs".
If you are concerned about the marital home, that could be a different matter. If it was bought by one party before marriage & entirely with that party's money (i.e. that person paid the deposit & all the mortgage both before & after the marriage) then it might be OK if it is still owned in the sole name of the non-bankrupt. However, it is possible that the bankrupt may have accrued a "beneficial interest" in the house even without making any payments towards it so the Official Receiver would look into this. Go to the Insolvency Service website - there are booklets on various aspects of bankruptcy, including one on the effect on houses.