STAIRS-C is described as a 3000 element linear scanning array
Almost two decades later, a 2nd Generation system, STAIRS C was introduced, based on single axis scanning and a long linear array of approximately 3000 elements.
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/6542/654214/Albion--the-UK-3rd-generation-high-performance-thermal-imaging/10.1117/12.718612.short
In spite of being a 2nd generation thermal imager in terms of technology, that would be able to produce image resolution more than double what Catherine-MP’s 3rd generation (staring array) imager produces.
Catherine-MP was the outcome of the “Albion” project that the above paper is written about.