This thread reminds me of when I was a young airman (Airframes) & I asked some engine guys "Where does the thrust act in a jet engine". They can't have been very bright because they just told me the 'Change of momentum' business.
I then got hold of a flying AP & it had a diagram of the forward & rearward gas loads in a RR Avon engine (With & without reheat) that cleared things up for me.
It would be interesting to see all the forward & rearward gas loads in the Concorde intakes, engines, nozzles ect, after all, something is 'Pushing' somewhere, it just needs to be split down into sections to see where.
I can understand manufacturers having commercial secrets, maybe that's why they don't publish this information on the internet, but it all boils down to simple forward & rearward gas loads somehere in the works.