The holes are there-filled with mastic and sprayed over.

Thank you, Yes I managed to work that out this afternoon and carefully cut out a small hole to access.

Does anyone know whether there are any water ingress issues after cutting out these holes? I can see a steel face below the tapped hole but don't know where it goes? Thanks.

I would insert the bolts with sealing compound on the mating surfaces. Silicone gasket sealer would be the best way forward. Regards Peter

I can reseal the screws on removing the fixpoint feet etc, but would have hope this isn't necessary. Most people remove the rails and fixing points each time they return from holiday surely? It's going to be a bind if I have to try and seal the holes several times a year!

Maybe I should ask Ford if these holes need to be sealed at all times and if will this cause a leak problem into the car.

I guess you are thinking of roof rails that run front to back TeeCee, what the OP has is the cross bars on which you fix your roofbox/cycle carrier/whatever. You would usually only have these installed when you are likely to be using them.

I have a CMax which uses the same system and can assure the OP that there is no need to seal the holes when not in use. I've never noticed any water in the holes when not in use, so the trim covers must do a reasonable job. When the bars are fitted, the holes are obviously blocked, so any water drains along the channel. Even if water did enter, the holes are blind, so water doesn't end up making the roof lining damp.