Could they not at least fix the Tramlink Pre-Pay problem in the meantime
(where switching between feeder bus and tram or changing trams in the one
journey makes Pre-Pay more expensive than paper tickets because of having
to
touch in twice)?

I thought you only had to touch at the "start and end of your
journey"?

That is for the tube, National Rail and the DLR. With Tramlink you have to
touch in at the start of each leg of your journey.