Fair Trading and Enterprise Act

[KLakey]

Would anyone be able to point me in the right direction or indeed have a black and white answer on how definite the line is with the trader or not part of this?
In-particular with car sales eg if I bought and sold a small number, say 4 cars over the course of the year with the purpose of making a profit or at least breaking even with each purchase would this mean I am classed as a trader in the eyes of the law.

Thanks in advance