no it was not down to any knocks. This is what surprised me , it just occurred the first time , first thing in the morning.
I thought it had gone away but am aware it still there although its so slight that its not really an issue.
I've been doing DIY , cycling etc and its not botehred me.
Need to now contact the CAA and arraneg to get my medical record sent off to them and probably see a ear nose and throat specialist AME . Basically need to prove its not going to be a problem in the air.
Its so frustating, sort of wished I didn't phone the CAA in the first place!