Wind turbine blade manufacture

A method of forming a structural web for a wind turbine blade, the method comprising:

• providing a web member having a web portion and a flange portion extending away from the web portion, wherein the web member comprises a heel of substantially curvilinear form located between the web portion and the flange portion;
• providing a flange extender of substantially planar form, wherein the flange extender comprises a cured composite material;
• arranging the cured flange extender together with the web member such that the cured flange extender is positioned adjacent to the flange portion and such that a portion of the cured flange extender projects past the heel and away from the web portion;
• and then
• integrating the cured flange extender together with the web member in a resin matrix, or with an adhesive, to form the structural web,
• wherein the resin matrix, or adhesive, between the heel and the cured flange extender is externally exposed so as to permit a visual inspection of a bond between the web member and the cured flange extender at the heel.