Amazon Germany is selling this 5L engine oil for a low price. that is £6.52/L. These days I just could not find any shop or website in UK selling the low priced Castrol Edge any more.
Since I just check the website and not buying one. I am not sure how much delivery fee Amazon DE will charge us in UK. Also due to the same reason, the currency rate is not actual charge, it is just an estimation based on the currency rate from XE.com.