When telling stories in the past tense, I've noticed that Americans will tend to say "I was standing on stage..." or "I was sitting at our table at Friendly's last night when..." while the Brits will tend toward "I was stood on stage..." or "I was sat at our table at Nando's last night when...". It's quite interesting, that the British will generally use this passive past type structure while the Americans will generally use the continuous past for the same situations.
Does this phenomenon have a name? Has it been studied?
Examples of this used in British Speech: