Social democracy seemed close to being the natural order in 2000. Almost all governments in the western world were in the hands of broadly moderate left-of-centre administrations.
More than anything else, the result of the 2019 general election highlighted the huge divide between London and the rest of the UK. Government policy is now heavily focused on trying to close the gap.
Labour’s heavy defeat needs to be set in the context of the difficulties which left-of-centre political parties have experienced well beyond the borders of the UK.