Caveat emptor
On top of those substantial costs, add in the lost revenue which would have been earned in previous full-time employment. Probably brings the numbers up towards £160000.
Expensive old gamble that, involving your parents' house.
Still, good luck to you, but I agree with WWW that many fall by the wayside for the few that win through to a paid and "secure" job. That was certainly the case in the mid 90's when I shelled out a considerable wedge to get into the business on an old Shed.