Honeywell (COM DEV) produce a number of important satellite subsystems at the Edinburgh and Aylesbury sites.
Although this section primarily concerns space test facilities, it does encompass space development facilities and, in that context, it is useful to include a top-level summary of COTS space subsystems available in the UK. Honeywell has a comprehensive range of passive and active RF components and complete subsystems, with over 1000 flight units delivered to date.