Earlier this year I had our concrete gutters fully re-lined. Already there are some damp patches at the top of the interior walls. So, a complete waste of money. The next step will be either aluminium linings or complete removal and replacement with uPVC. Which is best. Aluminium lining companies say that their way is sufficient and can be guaranteed for 20 years. Also, that removal is a drastic operation that can cause structural problems. Gutter removal people say that their way is the best and only long term solution. Any advice gratefully received. Mike.