I suppose it depends on what you plan for the business if it is good or not. The owners must be close if not over retirement age and probably want to ease back rather than build the business. They have many items particularly in the way of castings that nobody else does so if you want those you have to buy from blackgates anyway.
They may not be that capable with computers so would have to bring someone in to develop the website, keep on top of stock control and deal with the web shop side of things. Question is will they increase business enough to cover those extra costs and even if they do would the small increase in profit be worth the hassle.