Hi Tomthumb,
I fully understand you wanting to position you and your family, and to get your "ducks in a row", before petitioning BR.
First off, why BR?
Have you researched your options, and spoken with a professional?
In respect of your vehicle, the OR will want to sell the vehicle, and give you 2k to purchase another vehicle. If you preempt this action, you could use some of the funds to pay for your BR, and after purchasing a vehicle no greater than 2K, put the rest aside for the OR/creditors.
If you attempt to siphon this excess off to a savings account/ friends account, the OR will; to put it bluntly crucify you.
They have far reaching powers, and have access to many databases one of which I am sure is the DVLA. If you post on the BR website, the sister site to this one:
www.bankruptcyhelp.org.uk there are a number of forum professionals who will corroborate this.
In fact I would urge you to seek professional advice on this matter, so has not to leave yourself open to the repercussions if you did take the wrong route.
Gd luck.