David - that armour is a great example of 'Spanish School' painting - as I understand it, and yes I think it is a fairly 'Euro' thing - there was a Greek site where it was almost a house style. Here are some aviation examples:
Most would agree that these are some lovely models, and have been completed exactly as the builder wanted, but are also fairly unrealistic in terms of what has happened to panel lines regarding pre- and post-shading. I think most elements of weathering and pre-shading could be described as exaggerated. 'Spanish School' is a tongue-in-cheek (irreverent) nickname I think.
I'm sure it takes considerable skill to achieve that look. I like the look if it is taken as art and even caricature (19th Century 'Spanish School' art I think is where the name came from but there are examples of Art like this through history so who knows) - but using the pictured Beaufighter as an example I'm fairly sure these are not entirely accurate depictions, however much I like them as art! Here is a 'Spanish School' painting of a bullfight. Note the strong contrast and emphasised outlines. Someone with a little too much culture and a keen eye made the link I guess!
Here is one from the 16th Century:
In some cases, where heavy weathering is needed (some of the Luftwaffe in Africa for example where planes were sometimes tidied up only intermittently when they returned to Europe (sometimes Greece)) and in some of the Pacific Theatre aircraft, this is arguably an approach worth applying. But only when the panel lines are not finished in such a 'perfect' and uniform way - even those panels routinely taken off would presumably have suffered 'non-uniform' weathering.
All that said I really love they way this Tempest is going and I can't wait to see the outcome of the paint job! It has been a mammoth effort and a magnificent WIP and I am excited to see the moment of truth approaching for an absolutely classic build!