I think it is a brilliant thing you have set up, I think the website looks good and that the service you offer seems to be genuine. However, as most people have highlighted, I think the prices are far too high. £35 for the repair, then you have to add postage each way. That is more or less £50. I know you were mentioning the valet service, but all bat repairers will offer a full refurbishment with a repair as standard.
I think that everyone starts a business to make money, however, you are not going to make a huge profit from a repair. For instance, I have been doing refurbishments and repairs now for 3 years, and I charge £20 for a refurbishment and £25 for a repair with full refurbishment. I send the bat via courier which is £8 with insurance, and then around £2 worth a sandpaper per bat, leaving me around £10 per bat.