Help & advise needed blocked roof gutter & leak coming through wall

Hi for the past few weeks we have a blocked gutter on the front of our house, also the gully's are full of moss. The blocked gutter is located above our porch roof at the top on the main roof, the roof on our house is pitched. When it rains we noticed that a part of the porch floor was starting to get wet right by the inner porch door, the water was initially just coming through the top of the inner porch door, then over the past few days we noticed that the water leak has spread a bit and is also coming down the inner wall which is connected to the porch. We thought initially that there was a problem with the porch roof, however the porch roof itself seems fine. No apparent damage to the tiles or lead flashing on the porch roof. The water is coming from the blocked gutter above the porch roof on our main roof and that water has been pooling through the facial and somehow coming down through a small section along our front wall above the porch. We also noticed that the bedroom wall above the porch is wet and the wallpaper has peeled off, could there be a problem with small section of the felt lining in our main roof or fault with the lead flashing we are not sure and would appreciate some expert advise thankyou.