Museum of Scotland - "We do have a ‘Monarch 120’ from 1982 in our collection which is in storage and a wide range of telecommunications objects that were acquired as part the BT Connected Earth project in the early 2000s."

https://www.nms.ac.uk/search-our-collections/collection-search-results?entry=618834 

Private digital telephone exchange, 'Monarch 120', in beige and brown painted metal casing with lockable door and three keys, made October 1982 

in our collection we have the following connected to Glenkindie and the UXD5:

• T.2023.14.1 - Meter driver card, used in the Glenkindie Telephone Exchange UXD5, Vero Electronics, 1970s

• T.2023.14.2 - Multiple signalling junction card, used in the Glenkindie Telephone Exchange UXD5, Vero Electronics, 1970s

• T.2023.14.3 - 8-port subscriber line card, used in the Glenkindie Telephone Exchange UXD5, Vero Electronics, 1970s

• T.2003.256  - Two electronic exchange units from Glenkindie, Aberdeenshire (on display)

• T.2004.373  - Telephone 700 type, no. 8756, ivory with plastic coiled flex, push buttons numbers, label at front printed 'Glenkindie 250', 1982

I have a few Monarchs inclusing an early 120 from scotland and some compact models

My Monarch