This document follows our consultation on the collection of additional data to inform the regulation of the developer services market as part of the 2024 price review (PR24). We explain how we have considered the feedback received from stakeholders and outline the changes we have subsequently made to the developer services information request, which accompanies the main consultation document. We also provide guidance to companies when completing the information request. The deadline for receiving completed data requests and accompanying commentary is Friday 8th October 2021. Please email the completed data request and any accompanying commentary to [email protected] Published alongside 'Developer Services - information request pro formas'.