Flexible Chimney liner is usually the easiest way of lining and insulating an existing chimney. Lining and insulating your chimney makes it safer and makes it work better - which in turn means your stove will also work better. If your chimney is made using terracotta liners then installing a flexible chimney liner is also a good idea - these are only really good for open fires in my opinion.
It will take our designers 24-48hrs to complete your design, more during busy periods.