submission date and job abroad

[obormot]

Trying to help a friend who just submitted application. It seems they got two issues:

1. They were working in UK all the time (so they will upload P60 forms), but they also had part-time employment abroad for a couple of years, which they did not list. Should they have mentioned it in the form?
(I guess they can still write about it in a cover letter)
It is not self employment, but it is (clearly) something where there is no PAYE. Should they submit tax form?

2. They submitted on Saturday (25/07), and received email with payment confirmation and application number ("Reference number UKVI..." - with some letters and numbers).
Then on Monday (27/07) they received another email from UKVI - "thank you for your application" with case number (8 digits).
Which one is the date when "application was received by HO"?

Apparently they travelled out of the country on 28/07 five years ago.. (i.e. they were in UK on the 28/07 in the morning, and then took a flight to leave UK in the evening).
Guidance says "if application was received on 27/07 then you had to be physically present 5 years ago on 28/07". So probably even if the date of application is 27/07 they might be fine.. (since it seems HO counts days of departure as days when you were physically present, no?)

Any opinions? Thanks!

[CULLINAN]

The date of application is the date you pay and submit i.e. 25/7/2020 in your case. So he should be physically present 5 years ago on 26/7/2015.

If he left on 28/7/2015 there are no issues.

Only employment in UK is required to be listed not abroad.