Each sat does have 4 clocks two hydrogen Mazzer and two iridium to get fancy stuff it needs a mazzer working. And they haven't worked out what's going wrong mainly because they can't get their hands on a failed unit, Its very current news still. Maybe you know more than guys working on the project.
Out of the 22 sats up there two are in the wrong orbit...… And sort of work but again they can't take part in the fancy stuff.
The ones that are left 3 are the test beds, IOV stas and are coming to the end of their life, and they are working perfectly but running out of fuel.
So out of that 22 there is 11 sats functioning that are mainstream and 4 in commissioning for launch . From that lot that are up there and working there is 6 which are on there second mazzer with no back up. if that one goes they are onto the iridium clocks which means the high precision signal is not possible any more.
So out of 22 there at 5 satellites which could be deemed 100% functioning fit for use with backup with a long term future. They need 30 of them up there for a complete functioning system. Its going to cost the Uk the same if they build their own system or pay into Galileo more than likely less because the UK won't have to pander to partners national interests.
And they will have full control of the system instead of a partner disagreeing with foreign policy and turning the signal off.
Anyway we shall see what happens. Can't see it completing myself unless its just pure political force and weeing money up the wall to make it work to not loose face.