Is there a way of getting back to my original home land if I don't have a passport or supporting document that proof where I was born. However, my current UK passport does state my place of birth.
I am sorry to say this, but I just had enough of the surrounding people.
My internal 'troll alert' is working overtime here but, just in case this is a genuine post (which I doubt!) the only people who can answer your question are here:
http://www.cambodianembassy.org.uk/
If you were not born in the UK you will have applied for the right to remain here. Documents from that application will still be lodged with the UK Border Agency, try contacting them.