As I said before, a Will made in England and Wales would be valid if it mentions the intended union. The law in Scotland is different. There a spouse has prior rights and cannot be excluded from inheriting.
If the Will was made in England or Wales, didn’t mention the intended union so was made invalid on marrriage, then OP could inherit a substantial sum under the rules of intestacy.
Regarding the joint business, If husband and wife hold shares in a company jointly, on the death of one joint owner the legal title to the shares passes automatically to the remaining joint owner or owners rather than, as with any property held in the sole name of the deceased, into his estate. Assuming it is the husband who has died, then the widow will take the legal title in the shares by right of survivorship rather than under the terms of the deceased husband’s Will or on his intestacy.
I’m not sure I understand what OP means by not drawing his pension due to taxes or what kind of pension she is referring to. Does she mean he is a deferring his State Pension of money in a Defined Benefit (DB) scheme, Defined Contribution (DC) scheme or Self-Invested Personal Pension (SIPP)?
He sounds mean and controlling but I am wondering why OP has no other income (assuming she doesn’t). If she is in her late 60s, where is her State Pension? As a company director she will have been liable to Class 1 NIC (or credit for Class 1 if her pay from the directorship fell below the primary threshold). Presumably she worked when she was younger and/or could claim NIC credits under Household Responsibilty Protection if she stayed home looking after children.