Obviously due to your FMIC kit, the stock
BOV cant be fitted.
Personally if you are concerned with what a workshop has done, call them and ask rather than getting vague replies off us forum monkeys. They have done the work and know exactly what has been done or needs to be done to your car.
I'm sure a 5 minute phone call will give you a recommendation of
BOV and if it is ok to give your car a thrash in its current condition.