I understand that in order for the product to be successful and for the idea to be put into practice, I would need to consider funding. I believe that crowd funding is one of the best options. I am aware that companies such as Kickstarter are designed specifically for projects like this.
I could also consider contacting organisations such as the British Deaf Association or Action on Hearing Loss to see if they would offer partnership, sponsorship or any form of funding. I could also contact companies such as Mind Rockets Inc. who have existing products that serve similar purposes.