Ditch,
Go to your GP and get one off the NHS!!!!
My father paid over £1000 for the "Hidden Hearing" Digital ones, and they were crap from day 1!!!!
Eventually he went to his GP and got ones off the NHS, and they really work. Normally your free to pop into your nearest hospital too, for free batteries and repairs.
They even gave him a little DIY course so he can change the little plastic tubes on them himself
Hes been wearing them now for about 7 yrs!!
He went back last week as one was faulty, and they are now giving him new digital ones for free!! They are basically