Improvements relating to wind turbine blade manufacture

A method of producing a wind turbine blade, the method comprising:

• providing a structural web comprising:
• 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;
• and
• a flange extender integrated with the flange portion of the web member, wherein a first section of the flange extender overlies the flange portion and a second section of the flange extender extends past the heel and away from the web portion of the web member;
• bonding the flange extender of the structural web to the inner surface of a windward or leeward wind turbine blade shell using an adhesive to form an adhesive bond;
• and
• using non-destructive ultrasonic test equipment to assess the integrity of the adhesive bond, wherein assessing the integrity of the adhesive bond comprises identifying first and second target surfaces of the structural web, wherein the first and second target surfaces are spaced from one another by an intermediate region in which it is not possible to positively identify any surface using the non-destructive ultrasonic test equipment, wherein positive identification of the first and second target surfaces is indicative of a good integrity bond in the intermediate region, and wherein positive identification of only one, or neither, of the target surfaces is indicative of a poor integrity bond in the intermediate region.