I have it it confirmed today by the SW dealing with DD that I was indeed investigated by SS for FII last year when I had SS involvement, but it was proven not to be the case because my DC's DO have genuine health issues, and it WAS a health professional (my Current and soon to be ex GP is my best guess given the SW's hints and his refusal to attend the CIN meetings last year.) that referred the allegation.
They have NO issues with FII, and I pointed out to her that a lot of parents with children suffering from EDS and hypermobility syndrome have been subject to these allegations, and that there have even been conferences about this subject involving EDSUK and HMSA.
She is going to do some research into that!! She was shocked by the whole thing on going through my paperwork, and said that she will ensure that it doesn't happen again.