Transfer of Assets Between Spouses

I have a Company director who has a terminal illness and wants to transfer his shares to his wife.

HMRC guide GC22010 says that transfers take place for such consideration as will give rise to neither gain nor loss for the transferror.

There is a commercial building on the balance sheet as well as cash deposits.

My question is - what is the value of the shares for the transfer - the nominal value (£1 each) or a value based on the strength of the balance sheet?