Graduate / Chevening scholarship will enhance my leadership skills and prepare me for managerial positions [3]

Nuku, I think your introduction is quite different from what the body of the essay talked about. If you must want to put this introduction, then let it be linked to how your dear father encouraged you to be the best version of yourself and standout or something relating to leadership, so that your examples can be in line with your intro.

Please check your punctuations and use capital letter after full stop.

... which I have been honed over the years.
Also, in you third paragraph,
Then one day Managing Director called for ...

You can make a better statement, your story became boring at some point. Consider something like this: in one of the meetings organized by the Managing Director, I suggested to the administration that English speaking would be a better language of communication for effective.... Even though it wasn't initially accepted, through my persistent influence and initiation of ideas on how to go about achieving this... the management finally adopted and encouraged all staff to hone their English language skill. As a result, I helped teach few Staff English language outside of work... I don't know but I think something like this will be better.

Scholarship / Chevening essay; my definition of leadership [2]

@Bukola
I dont know why you had to put that huge number of words in your introduction. Can you just try to use one or two sentences or maybe three in your intro. Don't get the reader bored at the beginning part of your essay. Remember If I am correct, this is the chevening first essay.

While I was wondering that the first paragraph is quite too long for an intro, the second paragraph instead of going straight to the point of mentioning an example, it started with another long introductory statement. Just try make it short.

Today, I have students successfully enrolled into schools and fully sponsored. Please add statistic to this, it makes it credible.

Essays / Chevening Scholarship - can I put a former employer as a reference? [2]

@frn45
Now I am wondering how you will justify your networking skill. Two years isn't far. It is advisable to get an academic referee. Two years is quite Close to say you don't have an academic reference. However, I have seen people with two professional referees win the scholarship. So you can use your previous employer.