To be fair that is what it costs in Germany as well under normal circumstances. A day ticket for central Hamburg is about 8 EUR a day. And even that is cheap

To be fair that is what it costs in Germany as well under normal circumstances. A day ticket for central Hamburg is about 8 EUR a day. And even that is cheap compared compared to Oslo and Stockholm where it costs 12-13 EUR a day. On the whole the London Underground is quite reasonably priced compared to many major European cities.