Honda type 2 0 20.
https://www.coxmotorparts.co.uk GENUINE HONDA 0W20 TYPE 2.0 SYNTHETIC ENGINE OIL 4 LITRES
That is what local Honda dealer sold me. £50 / 4 litre ( and intakes just under 4 ltrs)
Others have stated Honda dealer use Morris
https://www.morrislubricants.co.uk 0 20
Castro edge has Honda approved. logo. Castrol EDGE Titanium Professional H 0W-20 (Honda)
Honda Ireland lists a hybrid oil not just 020, Honda green oil. But not sure That This is up-to-date.
https://www.honda.ie/page/209/honda-genuine-oils-lubricantsFor 0 20 oil, the Honda oil from Honda dealer is at most £10 more than I could see other brands including eurocarparts qx
Believe that it is SN grade that is required, so there are many choices.