Ok, Sorted !
I have made a change to the txt mission file which had a section at the start with requirements listed. The UH-60 was in there. I have taken it out. Re saved the mission file to check it did not put it back and all good.
loaded it up to the server and with the module disabled on my machine I was able to connect to our server so FT (and anyone else who does not have it) should be ok.
Not sure why that happened.