Never used this but thought it may be of interest! http://www.frost.co.uk/millers-oils-classic-pistoneeze-20w-50-multigrade-engine-oil-5-litres.html
I think the old duckhams multigrade Was 20/50 I used to put it in mine lovely green colour it had a nice smell when it was new also
Have used this for the first time this oil change and all seems good, (type 4 2.0l fi) nb handbook stays mineral 20/50. Paid £28 on line but the Castrol 20/50 from VHW £24.95 sounds good.