Is it coming from the taxpayer's purses? Or is it being subsidised by higher British Airways air fares? Either way, it seems an incredible waste of time and effort.

Concorde is already way beyond it's useable lifespan. It's crude, inefficient, so hideously expensive that most people will never fly on it, and has a history of failures that most of the public don't know about. Shouldn't we be spending the time and money researching newer, cleaner, faster aircraft instead of trying to resurrect Concorde for the sake of nostalgia?

Even if it does fly with fare-paying passengers again, it's lifespan is extremely limited and only the ultra-rich can afford to fly on it.

The term 'flogging a dead horse' seems curiously appropriate.