GOM
living vicariously
I'm not an expert in this but I note that the UK spends nearly £200 billion on healthcare - just over £40 bn on private health (something that's almost unknown in Germany). When you take that into account, the differential isn't so great (it's about 30% more).
A lot of that spend on private health is from company's private health plans - something not so different from Germany's tax on employers - that's one area to explore.
You're also not comparing like with like: I think (and Herr T can correct me here) that Germany's figure includes holistic medicine, even things like yoga classes - that aren't in the UK figure. Add those and we'd be a lot closer to the German model
You are suggesting that companies and individuals that currently pay into private health care plans would transfer that directly to the NHS. The difference is approx £95bn using @HT figure of 65% increase per capita, that would nowhere near cover it. Also there would be no need for private health care if we matched German spending so private costs/healthcare would not exist (would they ?). The funding would have to come from somewhere.
In favour of matching, but how ?