By the time I reached the end of primary school we had to analyse complex sentences in terms of three or four kinds of subordinate clauses, but never did anyone refer to adverbial clauses or phrases as 'fronted'! Stylistically, putting the adverbial clause or phrase before the main clause or after it, alters the balance of the sentence and can change the tone.
'When I saw the time, I panicked' has a different tone from 'I panicked when I saw the time.'
I loved grammar at school!
When is a royal tour, not a royal tour?

