Your big picture of CC House is still his former Strathclyde uniform but it definitely gives you a clear view of the "thistle" gorgets.
You mentioned "St John Ambulance" -- this is a actually non-statutory voluntary organisation. The statutory National Health Service provider for emergency and non-emergency ambulance services in Scotland is The Scottish Ambulance Service (SAS). Unlike the police and fire/rescue services which have only recently merged regional services into their respective National services, the NHS ambulance service in Scotland has been a national service for many, many years. (St Andrew's Ambulance had a voluntary role similar to St John in Scotland.)
These are versions of the bullion cap badges for the formal uniform of a senior officer/manager:
(Again, note the use of the Scottish Crown, not St Edward's Crown.)
This is the enamelled metal cap badge for other staff:
Formal dark blue (or in some cases grey-blue) peaked caps and tunics have not been worn regularly by ambulance staff in the UK for many years now. Green is the standard colour for medical services in the UK (with blue for police and red for fire/rescue) and more practical working uniforms are worn by British paramedics and EMTs. The shade of green may vary according to regional / national procurement depending on where you are in the UK. London and many other parts of England wear a fairly dark green but scotland have a rather brighter green:
In truth, the NHS ambulance services in the UK are very much regarded as "healthcare" organisations and are seen as an integral part of the National Health Service, albiet having a special emergency role within the NHS. Although formal uniforms are still worn for certain occasions this is generally relatively rare now and the ambulance services tend to have a more "managerial" structure than an "officer" structure. In many areas of the UK, rank markings for ambulance managers tend to be in gold on green uniforms (when uniform is worn) and, when formal uniforms are used, these are usually dark green with oak leaves and other peak embroidery on caps in gold and gorgets are also dark green with oak leaves or russia braid centre-cord in gold.
I'm afaid I'm not up to speed with current Scottish Ambulance Service non-operational uniforms. The formal uniforms used to be dark blue jackets with silver insignia and buttons, white shirt with corporate navy blue tie and grey trousers with black shoes. Caps were dark blue with a green welt (I think), badges as above, and silver peak embellishments. Gorgets, where worn, were dark blue with (if I recall correctly) green leaves or central braid, depending on rank. I honestly have no idea whether they used thistles or oak leaves...!
I equally have no idea what they use now -- or even if they still use any form of formal uniform at all. I still have a few contacts in the SAS (no, this one, not that one) so I'll see if I can find out for you.