Since much of our research centres on method development access to ‘instant on’ resources is essential. Our group cluster Hartree supports this work with 10 compute nodes. Initially supported by a Royal Society Equipment Grant and recently by the ERC project topDFT, Hartree now has 592 AMD based compute cores with 256Gb of memory on each node. One node is dedicated to push triggered and nightly testing of our code base via a GitLab CI runner.