I have a TB90 (Theoben took some early HW90's and made them a bit nicer) and it's certainly FAC, been a while since i clocked it but it was doing 22ft'lbs with accupell last time i checked.
Quite nice to shoot and very accurate.

What dealer is it ?

I wouldn't be too concerned that it's not coming from Hull Cartridge, quite a lot of our guns come via "Frankonia" in Germany, if you buy from a good dealer here you should have no problems.

Drop me a PM if you don't want to name names online