If you look at most shops accounts, and remove the labour (as many small businesspeople do), you are still on thin ice.
The UK isn't really setup to encourage small businesses. It never has been. The worst thing about winning WW2 is that it gave the state a taste for Big Projects that the war had shown the UK was (surprisingly) capable of. This led to the establishment of monolithic industries with very little room for freedom. This is the "socialism" that the US despaired of.
Inevitably having such single sources of income meant the sharks realised they could gobble up the taxpayers their money much more efficiently. So we moved seamlessly from nationalised to privatised where the sharks could rip open the meaty beasts and break them into a myriad of upward-feeding companies. All of which "needed" ex MPs on their boards as a sort of ideological St, Christopher on their journey to the bank.
The overall effect of this was to make sure that if there is a profit to be made, it's not for the little person. Whose role in all this is to continue electing governments that ensure the wonga goes one way.
I am still waiting to hear about my BBC4 3-part history series.