Habitual action of past

LeGion12359Which one is correct?

Both are correct and both are natural.

CliveBoth are correct.

And this one, too:
When I lived in London, I used to get up at 5 am so I could get to work by 6.

AlpheccaStarsBoth are correct and both are natural.

All right. By the way, Is there any difference of meaning between the two?

CliveBoth are correct.I'd say more simply this.When I lived in London, I got up at 5 am to get to work by 6.

We are talking about temporary habitual action of past here ,and it would be incorrect if we use past simple without using a time word like 'always'. What do you think, Teacher?

LeGion12359 Is there any difference of meaning between the two?

Not really.

AlpheccaStarsAnd this one, too:When I lived in London, I used to get up at 5 am so I could get to work by 6.

Yes Teacher. However, I read at an authentic website that 'used to' and 'would' are used to refer to a prolonged habitual action of past, while simple past (without 'used to' and 'would') and past continuous are used for a temporary habitual action of p

What is a 'temporary habitual action'?

A habit is an activity that you repeat over and over. It might be a bad habit or a good habit.
Smoking is a bad habit.
Jogging is a good habit.

"Used to" and "would" are for habits that you had in the past, but (usually) you don't have anymore.

I used to smoke.
When I was in university, I would jog every morning at 6 am.
When I finished school, and went to work