Hi Mags, Like bro said, it is worth putting all the evidence in.
If it would help, I just heard this afternoon, after only sending in further evidence two days ago, that my face2face scheduled for the beg of next week, has been cancelled pending their looking at the new evidence.
As your GP has written a lovely letter which sounds positive, I would send it in. I was informed that they had called me for face2face due to insufficient data on the GP's report (and I have since seen the report and it is true, it was like done by someone in a hurry).
Who knows after reading my new evidence, they might decide that they do not need any face2face at all.