There’s noth­ing Gourmet Gigs likes more than a com­bi­na­tion of music accom­pa­nied by inter­est­ing culi­nary or alco­holic refresh­ment. Last Tues­day offered such an occa­sion, with the added mys­tery of a loca­tion in the heart of an indus­tri­al estate in Waltham­stow. Just to rewind: The End fes­ti­val in Crouch End two weeks pre­vi­ous­ly had fea­tured a band called Firesta­tions, who caught the…