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Spml loading is exactly the same as regular meal loading. So on flights that are return-catered (essentially all of Europe) spml will be return catered too with a few limits to night stops (eg no ksml). On flights that are locally catered (essentially rest of the world) the spml are locally catered too with any limits based on what the local supplier contracted by ba does/does not offer.
for that reason also worth remembering locally catered spml can vary a lot in quality - existing threads have shown the occasional « banana catering » in the most extreme cases. Of course that won’t be the case from yyz though which will be well supplied.