My wife went through her review 6 months ago after 3 years of previous award. The original award was only given after 8 months of reviews and finally a tribunal decision. I think it is very helpful to have supportive letters from qualified medical staff that they will find hard to discount. In my wife’s case her consultant professor of neurology gave them little room for manoeuvre with her detailed opinion of her capabilities/conditions in a letter . The result was a 10 year award with only soft-touch review at end of period. Indeed they increased her award to include higher rate of mobility component . This was all done without a telephone interview and i believe highlights the need to be thorough with completion of the paperwork and the importance of obtaining supporting evidence.