HEAnet have partnered on a pan-European collaboration with GÉANT to put in place the OCRE procurement framework for public cloud which you can use. This will save you time, money and give you peace of mind while using this procurement framework.
You can purchase directly from the cloud vendor of your choice without having to go through a lengthy tendering process. More details on the Heanet OCRE framework, also called the IaaS+ framework, can be viewed here.
More details on the European GÉANT OCRE framework can be viewed here.