Interesting. The London system is ancient, creaking, lacks modern conveniences like mobile coverage/wifi/aircon, and has comparatively small trains that get horribly overcrowded at peak times. It it probably a worse experience than most European metros (unless you're using one of the few new lines). But it does get a decent amount of investment and fundamentally it works. If only we could get a comparable level of investment in the rest of the UK.
Regretted systems: guided buses. Both Edinburgh and Cambridge regret theirs and Edinburgh built trams over it instead (with massive disruption and cost overrun, but not actually regretted yet).
Regretted systems: guided buses. Both Edinburgh and Cambridge regret theirs and Edinburgh built trams over it instead (with massive disruption and cost overrun, but not actually regretted yet).