Ok, I realize I am totally coming out of left field here, but here goes.
I have bought from Martin on two occasions.
One a Dell and one a Yoga 910 (using it right now)
This was before he had a website and only sold via Gumtree.
Both machines were brand new and sealed. I went to his house where he opened them in front of me so I could inspect them before I paid through any money.
I was able to register both on their respective support websites and both had support in South Africa.
I have personally ever had an issue, and am currently looking at buying a Microsoft Surface from him.
I am in no way associated with this company.
I only know Martin through Gumtree and have only met him on the two occasions mentioned above.
Just my 2c worth