Yes, a week before the sale of the business happened. I provided him with a copy of his hand written agreement. He ignored it and I did not pursue at that time as he was quite stressed with the whole process of selling.
Thank you for your answer. My feeling is that my ex Boss provided me with this hand written note to ensure my loyalty over the years, and essentially locked me into the company whilst he was there on the promise of some 'financial reward' upon his eventual sale. The note is over 10 years old. I also feel that by preventing me from being able to assist in the sale (by not even telling me until it was all done) I have not been able to fulfil my side of the arrangement through no fault/action of my own. If I am prevented from performing my side of the deal by the other party to the contract surely that is a breach?