We bought some shares through our bank's share dealing service - which they have now advised us they are closing down, so I'm not sure how we would go about selling them. They were intended as a long term investment for our grandson, and the dividends go into his savings account, but they have done so badly in the last year that we are considering cutting our losses. You could enquire whether your bank has a share dealing service (unless it's Barclays!); otherwise, as Ana suggested, contact the company.