What is the Scottish-built instrument?
It's the "Mid InfraRed Instrument" or MIRI, which has been built and tested at the UK Astronomy Technology Centre at the University of Edinburgh :
https://www.technologysi.stfc.ac.uk/Pages/MIRI.aspxI got a look at it during development a few years back during a tour of the facility as part of a conference at the Royal Observatory Edinburgh. It promises to deliver some very high quality results.