Hi Dan
Yes, £38 is cheap, so you can see £18K net is achievable.
Also, one breath, Quote, "he not only cleaned our carpets to a colour only once seen (in the factory)... another breath, quote, "£38 for an hours work".......
You get what you pay for, don't compete on price, compete on quality of service and results!! which will only come with training, experience, training... oh, and training.
Get back in touch with the guy that cleaned your carpet and ask him if you can spend a day with him, get some hands on..
Hope this helps
Chris