In a Community of Property Owners, you should first discuss this flue with your President or Administrator. Your neighbour should have obtained permission from the Community in order to place anything on the outside of his wall. You and other affected neighbours can also bring up the matter at the AGM, by asking the President to put it on the official Agenda. If none of this gives results, you have final recourse to your town hall.
Send your questions for David Searl through lawyers Ubeda-Retana & Associates in Fuengirola at Ask@lawtaxspain.com, or call 952 667 090.