Ah, fair play to you. Sorry, I didn't see your edit before I posted.
The current UK system is fairly complex but if you add the guarantee credit to the basic pension you get to around £150 per week. Add UK inflation and you get to around £155. The new single tier system in the UK is intended to be broadly "cost neutral" from an exchequer perspective but will generally not favour younger workers.
In any event, a difference of even 9% is still massive, particularly when you factor in our very low local authority or property taxes for individuals.
Without adjustment, we are projected to spend around €15 billion per annum on old age and public sector pensions by 2026. Add in the higher healthcare costs associated with an ageing population and the problem becomes clear. Project out 20 years further, and the situation looks completely unsustainable without adjustment.