Apple
There's no reason why a letter should not use reliably or any of the four phrases that it encompasses, the key thing is that the writer needs to explain why they are doing so. So I the letter says that you cannot repeatedly walk 20m, then it also needs to explain why you cannot do it more than once.
This is explained in detail in the PIP Claim guide.
There has been no further news on whether there will be a change to the PIP criteria in regard to aids and appliances.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems