Gas Safe Registered Heating Installer, based in North London. I have been installing weather and indoor compensated controls since 2005, and have an above average appreciation as to how they work, and their  transformatory nature for the client end user and installation companies. i count on several hundred installations of this nature, and a growing number of heat pump installs which use the same controls   my reviews can be found here   https://trustedtraders.which.co.uk/businesses/integrated-heating-ltd/#reviews