Was doing a clear out of old paperwork in one of the filing cabinets, and checked this folder and they were in there with all other associated paperwork from when others were sold. Each time the cert. had to be sent in to sell them, so yes I would say that they haven't been sold.
They are actually the wifes, as part of a yearly bonus scheme that they ran at the time, for employees. Had to be held in trust for x years before becoming tax free. At one point she had about 3000 available and about 500 in trust
These are worth about £600-650. Wife not bothered about them but I'm for selling them and putting it towards a family holiday