erm dynamic nanny it is not okay to do this even in reception and year 1!
Just because they dont do SATS in these years it doesnt mean they shouldn't be in school in time. They miss valuable parts of the daily routine, at my school 15 mins late and they would miss things like handwriting practice, speaking and listening, guided reading, mental maths (these things dont get repeated for latecomers), and if they are 5 mins late then the entire class or at least a group would end up missing part of one of those things while the teacher deals with the latecomer, making sure they have been put in the register at the office, that they have ordered the lunch if they need one, do they need their book changing etc etc - it is unfair on the child concerned, the rest of the class , the office staff and the teacher if it is done continually no matter what year the child is in.
i have every sympathy with your friend charlie cat and the above is not aimed at her (just makes me really angry when people think what happens in reception and year one doesnt matter), i have been fighting depression for the last 2.5 years, 2 of which i have had to get dd to nursery at 7.30 3 mornings and then drive 15 miles to work - it can be done and at times it is like hell and i arrive at work in tears but it sounds like your friend is really intent on making this situation better for herself and the children and that she needs help, so if the EWO is a good one then then getting involved wont neccesarily be a bad thing.
In my situation i know that somtimes the only thing that works for me is having no choice at all about somthing (eg for me, i have to be at work by 8am, latest) so someone official getting involved may be the kick start she needs (as long as they come with some helpfull advice of course)
i know i would second the idea of a very loud alarm clock set at least 30 mins before you have to get up, and also getting everything ready the night before too.
you dont say how old the children are but maybe they can have alarm clocks too (if they are school age then i'm sure they could work them) and if they are old enough to make themselves a bowl of cereal or even eat a cereal bar if its easier, then also get them selves dressed - use a star chart or treats to make sure they actually want to do it, then your friend only hads to get out of bed put on her clohtes and walk out the door.
or how early does her partner leave the house, can he supervise them getting up and dressed and sit them in front of c beebies with their breakfast to help) my dh leaves a bit before me but he has done this for me a few times when i've had a really bad night
i am a teacher and i know EWO can be informed about any kind of lateness if it happens very often (enough for school to be concerned) this includes being late before the register returns to office (as this is marked too) being late after it has gone to office and also parents turning up late to collect. It is done for the childrens best interests, if any of these things happen on a regular basis it can really affect the child, honestly.
Sending postive thoughts to your friend, hope she finds somthign to help her get this one sorted